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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 22, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Alkermes plc.
Entity Central Index Key	0001520262
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		156,904,489
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	ALKS

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 225,234	$ 266,762
Investments—short-term	356,894	272,533
Receivables, net	222,811	292,223
Contract assets	8,447	8,230
Inventory	92,861	90,196
Prepaid expenses and other current assets	56,492	53,308
Total current assets	962,739	983,252
PROPERTY, PLANT AND EQUIPMENT, NET	320,004	309,987
INTANGIBLE ASSETS, NET	181,049	191,001
INVESTMENTS—LONG-TERM	43,005	80,744
GOODWILL	92,873	92,873
CONTINGENT CONSIDERATION	37,600	65,200
RIGHT-OF-USE ASSETS	18,010
DEFERRED TAX ASSETS	87,605	85,807
OTHER ASSETS	13,651	16,143
TOTAL ASSETS	1,756,536	1,825,007
CURRENT LIABILITIES:
Accounts payable and accrued expenses	313,969	333,762
Contract liabilities—short-term	2,078	3,169
Operating lease liabilities—short-term	8,795
Long-term debt—short-term	2,843	2,843
Total current liabilities	327,685	339,774
LONG-TERM DEBT	275,923	276,465
OTHER LONG-TERM LIABILITIES	28,425	27,958
OPERATING LEASE LIABILITIES—LONG-TERM	11,020
CONTRACT LIABILITIES—LONG-TERM	11,342	9,525
Total liabilities	654,395	653,722
COMMITMENTS AND CONTINGENT LIABILITIES (Note 14)
SHAREHOLDERS’ EQUITY:
Preferred shares, par value, $0.01 per share; 50,000,000 shares authorized; zero issued and outstanding at March 31, 2019 and December 31, 2018, respectively
Ordinary shares, par value, $0.01 per share; 450,000,000 shares authorized; 159,577,874 and 158,180,833 shares issued; 156,885,028 and 155,757,344 shares outstanding at March 31, 2019 and December 31, 2018, respectively	1,593	1,579
Treasury shares, at cost (2,692,846 and 2,423,489 shares at March 31, 2019 and December 31, 2018, respectively)	(117,949)	(108,969)
Additional paid-in capital	2,502,773	2,467,323
Accumulated other comprehensive loss	(2,510)	(3,280)
Accumulated deficit	(1,281,766)	(1,185,368)
Total shareholders’ equity	1,102,141	1,171,285
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,756,536	$ 1,825,007

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock shares, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares, authorized	50,000,000	50,000,000
Preferred stock shares, issued	0	0
Preferred stock shares, outstanding	0	0
Ordinary shares, par value (in dollars per share)	$ 0.01	$ 0.01
Ordinary shares, shares authorized	450,000,000	450,000,000
Ordinary shares, shares issued	159,577,874	158,180,833
Ordinary shares, shares outstanding	156,885,028	155,757,344
Treasury shares	2,692,846	2,423,489

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
REVENUES:
Total revenues	$ 223,102	$ 225,150
EXPENSES:
Cost of goods manufactured and sold (exclusive of amortization of acquired intangible assets shown below)	45,361	44,476
Research and development	102,570	108,346
Selling, general and administrative	141,220	118,147
Amortization of acquired intangible assets	9,952	16,069
Total expenses	299,103	287,038
OPERATING LOSS	(76,001)	(61,888)
OTHER EXPENSE, NET:
Interest income	3,570	1,485
Interest expense	(3,500)	(5,487)
Change in the fair value of contingent consideration	(22,600)	(1,900)
Other (expense) income, net	(1,721)	792
Total other expense, net	(24,251)	(5,110)
LOSS BEFORE INCOME TAXES	(100,252)	(66,998)
INCOME TAX BENEFIT	(3,854)	(4,493)
NET LOSS	$ (96,398)	$ (62,505)
LOSS PER ORDINARY SHARE:
Basic and diluted (in dollars loss per ordinary share)	$ (0.62)	$ (0.40)
WEIGHTED AVERAGE NUMBER OF ORDINARY SHARES OUTSTANDING:
Basic and diluted (in shares)	156,336	154,424
COMPREHENSIVE LOSS:
Net loss	$ (96,398)	$ (62,505)
Holding gain (loss), net of a tax provision (benefit) of $229 and $(100), respectively	770	(336)
COMPREHENSIVE LOSS	(95,628)	(62,841)
Manufacturing and royalty revenues
REVENUES:
Total revenues	108,915	114,601
Product sales, net
REVENUES:
Total revenues	99,481	91,842
Research and development revenue
REVENUES:
Total revenues	$ 14,706	$ 18,707

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Tax (benefit) provision	$ 229	$ (100)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (96,398)	$ (62,505)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation and amortization	19,642	25,722
Share-based compensation expense	24,616	20,042
Deferred income taxes	(3,225)	(4,101)
Change in the fair value of contingent consideration	22,600	1,900
Loss on debt refinancing		2,298
Payment made for debt refinancing		(1,840)
Other non-cash charges	1,116
Other non-cash charges		(75)
Changes in assets and liabilities:
Receivables	69,411	19,430
Contract assets	(217)	(16,959)
Inventory	(1,700)	(431)
Prepaid expenses and other assets	(69)	890
Right-of-use assets	2,131
Accounts payable and accrued expenses	(15,888)	(14,123)
Contract liabilities	725	245
Operating lease liabilities	(2,297)
Other long-term liabilities	1,765	2,669
Cash flows provided by (used in) operating activities	22,212	(26,838)
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions of property, plant and equipment	(23,639)	(18,485)
Proceeds from the sale of equipment	85	324
Proceeds from contingent consideration	5,000
Purchases of investments	(102,127)	(35,995)
Sales and maturities of investments	55,978	79,500
Cash flows (used in) provided by investing activities	(64,703)	25,344
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from the issuance of ordinary shares under share-based compensation arrangements	10,554	13,164
Employee taxes paid related to net share settlement of equity awards	(8,880)	(15,724)
Principal payments of long-term debt	(711)
Payment made for debt refinancing		(737)
Cash flows provided by (used in) financing activities	963	(3,297)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(41,528)	(4,791)
CASH AND CASH EQUIVALENTS—Beginning of period	266,762	191,296
CASH AND CASH EQUIVALENTS—End of period	225,234	186,505
Non-cash investing and financing activities:
Purchased capital expenditures included in accounts payable and accrued expenses	$ 7,850	$ 7,516

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Ordinary Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Treasury Stock
BALANCE at Dec. 31, 2017	$ 1,202,808	$ 1,557	$ 2,338,755	$ (3,792)	$ (1,044,365)	$ (89,347)
BALANCE (in shares) at Dec. 31, 2017		156,057,632				(2,048,176)
Issuance of ordinary shares under employee stock plans	13,165	$ 6	13,159
Issuance of ordinary shares under employee stock plans (in shares)		539,563
Receipt of Alkermes' shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards	(15,724)	$ 7	(7)			$ (15,724)
Receipt of Alkermes' shares for the excersise of stock options or to satisfy minimum tax withholding obligations related to share based awards (in shares)		716,123				(261,159)
Share-based compensation expense	20,176		20,176
Unrealized gain (loss) on marketable securities, net of tax provision of $229	(337)			(337)
Cumulative effect adjustment related to the adoption of new accounting standards	(1,692)				(1,692)
Net loss	(62,505)				(62,505)
BALANCE at Mar. 31, 2018	1,155,891	$ 1,570	2,372,083	(4,129)	(1,108,562)	$ (105,071)
BALANCE (in shares) at Mar. 31, 2018		157,313,318				(2,309,335)
BALANCE at Dec. 31, 2018	1,171,285	$ 1,579	2,467,323	(3,280)	(1,185,368)	$ (108,969)
BALANCE (in shares) at Dec. 31, 2018		158,180,833				(2,423,489)
Issuance of ordinary shares under employee stock plans	10,554	$ 7	10,547
Issuance of ordinary shares under employee stock plans (in shares)		656,352
Receipt of Alkermes' shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards	(8,880)	$ 7	93			$ (8,980)
Receipt of Alkermes' shares for the excersise of stock options or to satisfy minimum tax withholding obligations related to share based awards (in shares)		740,689				(269,357)
Share-based compensation expense	24,810		24,810
Unrealized gain (loss) on marketable securities, net of tax provision of $229	770			770
Net loss	(96,398)				(96,398)
BALANCE at Mar. 31, 2019	$ 1,102,141	$ 1,593	$ 2,502,773	$ (2,510)	$ (1,281,766)	$ (117,949)
BALANCE (in shares) at Mar. 31, 2019		159,577,874				(2,692,846)

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Stockholders Equity [Abstract]
Tax (benefit) provision	$ 229	$ (100)

The Company

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

The Company

1. THE COMPANY

Alkermes plc (the “Company”) is a fully integrated, global biopharmaceutical company that applies its scientific expertise and proprietary technologies to research, develop and commercialize, both with partners and on its own, pharmaceutical products that are designed to address unmet medical needs of patients in major therapeutic areas. The Company has a diversified portfolio of commercial drug products and a clinical pipeline of product candidates focused on central nervous system (“CNS”) disorders such as schizophrenia, depression, addiction and multiple sclerosis (“MS”), and oncology. Headquartered in Dublin, Ireland, the Company has a research and development (“R&D”) center in Waltham, Massachusetts; R&D and manufacturing facility in Athlone, Ireland; and a manufacturing facility in Wilmington, Ohio.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements of the Company for the three months ended March 31, 2019 and 2018 are unaudited and have been prepared on a basis substantially consistent with the audited financial statements for the year ended December 31, 2018. The year-end condensed consolidated balance sheet data, which is presented for comparative purposes, was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States (“U.S.”) (commonly referred to as “GAAP”). In the opinion of management, the condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, that are necessary to state fairly the results of operations for the reported periods.

These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto of the Company, which are contained in the Company’s Annual Report that has been filed with the SEC. The results of the Company’s operations for any interim period are not necessarily indicative of the results of the Company’s operations for any other interim period or for a full fiscal year.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Alkermes plc and its wholly-owned subsidiaries as disclosed in Note 2, Summary of Significant Accounting Policies, in the “Notes to Consolidated Financial Statements” accompanying the Annual Report. Intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in accordance with GAAP requires management to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, judgments and methodologies, including those related to revenue recognition and related allowances, its collaborative relationships, clinical trial expenses, the valuation of inventory, impairment and amortization of intangibles and long-lived assets, share-based compensation, income taxes including the valuation allowance for deferred tax assets, valuation of investments, contingent consideration and litigation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions.

Segment Information

The Company operates as one business segment, which is the business of developing, manufacturing and commercializing medicines. The Company’s chief decision maker, the Chairman of the Board and Chief Executive Officer, reviews the Company’s operating results on an aggregate basis and manages the Company’s operations as a single operating unit.

Income Taxes

The Company’s income tax benefit in the three months ended March 31, 2019 and 2018 primarily related to U.S. federal and state taxes. The Company records a deferred tax asset or liability based on the difference between the financial statement and tax basis of its assets and liabilities, as measured by enacted jurisdictional tax rates assumed to be in effect when these differences reverse. At March 31, 2019, the Company maintained a valuation allowance against certain of its U.S. and foreign deferred tax assets. The Company evaluates, at each reporting period, the need for a valuation allowance on its deferred tax assets on a jurisdiction-by-jurisdiction basis.

New Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard-setting bodies that are adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued guidance that are not yet effective will not have a material impact on its financial position or results of operations upon adoption.

Effective January 1, 2019, the Company adopted the requirements under Accounting Standards Update (“ASU”) 2016-02, Leases (“Topic 842”) using the optional modified retrospective transition method and recognized a cumulative-effect adjustment to the condensed consolidated balance sheet on the date of adoption. Comparative periods have not been restated. Topic 842 was issued in order to increase transparency and comparability among organizations by recognizing right-of-use lease assets and operating lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between previous GAAP (“Topic 840”) and Topic 842 is the recognition of right-of-use lease assets and lease liabilities by lessees for those leases classified as operating leases under Topic 840. At January 1, 2019, the Company recorded a right-of-use asset of $20.1 million and an operating lease liability of $22.1 million. For additional information regarding how the Company is accounting for leases under Topic 842, refer to Note 9, Leases, in the “Notes to Condensed Consolidated Financial Statements” in this Form 10-Q.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU becomes effective for the Company in the year ending December 31, 2020, with early adoption permitted for the Company in the year ending December 31, 2019. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which addresses the accounting for nonemployee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation – Stock Compensation, to include share-based payment transactions for acquiring goods and services from nonemployees. This ASU became effective for and was adopted by the Company in the year ending December 31, 2019 and the adoption of the ASU did not have an impact on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-14, Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement, which aims to improve the effectiveness of fair value measurement disclosures. The amendments in this ASU modify the disclosure requirements on fair value measurements based on the concepts in FASB Concepts Statement, Conceptual Framework for Financial Reporting - Chapter 8: Notes to Financial Statements, including the consideration of costs and benefits. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). This ASU also requires the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements.

In November 2018, the FASB issued ASU 2018-18, Clarifying the Interaction Between Topic 808 and Topic 606, which clarifies when transactions between participants in a collaborative arrangement are within the scope of the FASB’s revenue standard, Topic 606. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements.

Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2019

Revenue From Contract With Customer [Abstract]

Revenue from Contracts with Customers

3. REVENUE FROM CONTRACTS WITH CUSTOMERS

Under Topic 606, the Company recognizes revenues when its customer obtains control of promised goods or services, in an amount that reflects the consideration the Company expects to receive in exchange for those goods or services. The Company recognizes revenues following the five-step model prescribed under Topic 606: (i) identify contract(s) with a customer; (ii) identify the performance obligation(s) in the contract(s); (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligation(s) in the contract(s); and (v) recognize revenues when (or as) the Company satisfies the performance obligation(s).

Manufacturing and Royalty Revenue

During the three months ended March 31, 2019 and 2018, the Company recorded manufacturing and royalty revenues as follows:

	Three Months Ended March 31, 2019
(In thousands)	Manufacturing Revenue		Royalty Revenue		Total
INVEGA SUSTENNA/XEPLION & INVEGA TRINZA/TREVICTA	$	—	$	53,298	$	53,298
RISPERDAL CONSTA		17,921		4,385		22,306
AMPYRA/FAMPYRA		5,680		6,506		12,186
Other		7,346		13,779		21,125
	$	30,947	$	77,968	$	108,915

	Three Months Ended March 31, 2018
(In thousands)	Manufacturing Revenue		Royalty Revenue		Total
INVEGA SUSTENNA/XEPLION & INVEGA TRINZA/TREVICTA	$	—	$	46,086	$	46,086
AMPYRA/FAMPYRA		13,563		14,696		28,259
RISPERDAL CONSTA		17,792		4,912		22,704
Other		6,236		11,316		17,552
	$	37,591	$	77,010	$	114,601

Product Sales, Net

The Company’s product sales, net consist of sales of VIVITROL and ARISTADA (together with ARISTADA INITIO) in the U.S. primarily to wholesalers, specialty distributors and pharmacies. Product sales, net are recognized when the customer obtains control of the product, which is when the product has been received by the customer.

During the three months ended March 31, 2019 and 2018, the Company recorded product sales, net, as follows:

	Three Months Ended March 31,
(In thousands)	2019		2018
VIVITROL	$	69,183	$	62,682
ARISTADA		30,298		29,160
Total product sales, net	$	99,481	$	91,842

Research and Development Revenue

The Company recorded research and development (“R&D”) revenue of $13.9 million and $17.5 million during the three months ended March 31, 2019 and 2018, respectively, related to its license and collaboration agreement with Biogen for Diroximel fumarate (“BIIB098”). The Company expects to earn an additional $77.6 million in R&D revenue under this agreement with Biogen through 2021.

Contract Assets—Contract assets include unbilled amounts resulting from sales under certain of the Company’s manufacturing contracts where revenue is recognized over time. The products included in the contract assets table below complete the manufacturing process in ten days to eight weeks. Contract assets are classified as current.

Contract assets consisted of the following:

(In thousands)	Contract Assets
Contract assets at January 1, 2019	$	8,230
Additions		7,346
Transferred to receivables, net		(7,129	)
Contract assets at March 31, 2019	$	8,447

Contract Liabilities—Contract liabilities consist of contractual obligations related to deferred revenue.

Contract liabilities consisted of the following:

(In thousands)	Contract Liabilities
Contract liabilities at January 1, 2019	$	12,694
Additions		1,516
Amounts recognized into revenue		(790	)
Contract liabilities at March 31, 2019	$	13,420

Investments

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Investments

4. INVESTMENTS

Investments consisted of the following (in thousands):

			Gross Unrealized
					Losses
	Amortized				Less than			Greater than			Estimated
March 31, 2019	Cost		Gains		One Year			One Year			Fair Value
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	156,443	$	349	$	(11	)	$	(149	)	$	156,632
U.S. government and agency debt securities		108,113		257		(4	)		(45	)		108,321
International government agency debt securities		91,818		193		—			(70	)		91,941
Total short-term investments		356,374		799		(15	)		(264	)		356,894
Long-term investments:
Available-for-sale securities:
Corporate debt securities		28,570		—		(84	)		(45	)		28,441
U.S. government and agency debt securities		10,984		—		(4	)		(5	)		10,975
		39,554		—		(88	)		(50	)	$	39,416
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Fixed term deposit account		1,667		102		—			—			1,769
		3,487		102		—			—			3,589
Total long-term investments		43,041		102		(88	)		(50	)		43,005
Total investments		399,415		901		(103	)		(314	)		399,899

December 31, 2018
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	120,197	$	57	$	(62	)	$	(274	)	$	119,918
U.S. government and agency debt securities		80,055		115		(11	)		(87	)		80,072
International government agency debt securities		72,091		85		(8	)		(117	)		72,051
		272,343		257		(81	)		(478	)		272,041
Held-to-maturity securities:
Corporate debt securities		492		—		—			—			492
Total short-term investments		272,835		257		(81	)		(478	)		272,533
Long-term investments:
Available-for-sale securities:
Corporate debt securities		53,505		—		(185	)		(93	)	$	53,227
U.S. government and agency debt securities		18,474		—		(21	)		(12	)		18,441
International government agency debt securities		5,457		—		(4	)		—			5,453
		77,436		—		(210	)		(105	)		77,121
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Fixed term deposit account		1,667		136		—			—			1,803
		3,487		136		—			—			3,623
Total long-term investments		80,923		136		(210	)		(105	)		80,744
Total investments	$	353,758	$	393	$	(291	)	$	(583	)	$	353,277

The proceeds from the sales and maturities of marketable securities, which were identified using the specific identification method and were primarily reinvested, were as follows:

	Three Months Ended March 31,
(In thousands)	2019		2018
Proceeds from the sales and maturities of marketable securities	$	55,978	$	79,500
Realized gains	$	—	$	1
Realized losses	$	492	$	4

The Company’s available-for-sale and held-to-maturity securities at March 31, 2019 had contractual maturities in the following periods:

	Available-for-sale				Held-to-maturity
	Amortized		Estimated		Amortized		Estimated
(In thousands)	Cost		Fair Value		Cost		Fair Value
Within 1 year	$	213,318	$	213,172	$	1,820	$	1,820
After 1 year through 5 years		182,610		183,138		1,667		1,769
Total	$	395,928	$	396,310	$	3,487	$	3,589

At March 31, 2019, the Company believed that the unrealized losses on its available-for-sale investments were temporary. The investments with unrealized losses consisted primarily of corporate debt securities. In making the determination that the decline in fair value of these securities was temporary, the Company considered various factors, including, but not limited to: the length of time each security was in an unrealized loss position; the extent to which fair value was less than cost; financial condition and near-term prospects of the issuers; the Company’s intent not to sell these securities; and the assessment that it is more likely than not that the Company would not be required to sell these securities before the recovery of their amortized cost basis.

In May 2014, the Company entered into an agreement whereby it is committed to provide up to €7.4 million to a partnership, Fountain Healthcare Partners II, L.P. of Ireland (“Fountain”), which was created to carry on the business of investing exclusively in companies and businesses engaged in the healthcare, pharmaceutical and life sciences sectors. As of March 31, 2019, the Company’s total contribution in Fountain was equal to €5.5 million. The Company’s commitment represents approximately 7% of the partnership’s total funding. The Company is accounting for its investment in Fountain under the equity method. During the three months ended March 31, 2019 and 2018, the Company recorded a decrease in its investment in Fountain of less than $0.1 million. The changes recorded represent the Company’s proportional share of Fountain’s net losses for these periods. The Company’s $5.6 million and $5.5 million net investment in Fountain at March 31, 2019 and December 31, 2018, respectively, was included within “Other assets” in the accompanying condensed consolidated balance sheets.

Fair Value Measurements

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. FAIR VALUE MEASUREMENTS

The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value:

	March 31,
(In thousands)	2019		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	62,556	$	62,556	$	—	$	—
U.S. government and agency debt securities		119,296		68,704		50,592		—
Corporate debt securities		185,073		—		185,073		—
International government agency debt securities		91,941		—		91,941		—
Contingent consideration		37,600		—		—		37,600
Common stock warrants		772		—		—		772
Total	$	497,238	$	131,260	$	327,606	$	38,372

	December 31,
	2018		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	54,590	$	54,590	$	—	$	—
U.S. government and agency debt securities		98,513		60,107		38,406		—
Corporate debt securities		173,637		—		173,145		492
International government agency debt securities		77,504		—		77,504		—
Contingent consideration		65,200		—		—		65,200
Common stock warrants		1,205		—		—		1,205
Total	$	470,649	$	114,697	$	289,055	$	66,897

The Company transfers its financial assets and liabilities, measured at fair value on a recurring basis, between the fair value hierarchies at the end of each reporting period.

There were no transfers of any securities between the fair value hierarchies during the three months ended March 31, 2019. The following table is a rollforward of the fair value of the Company’s assets whose fair values were determined using Level 3 inputs at March 31, 2019:

(In thousands)	Fair Value
Balance, January 1, 2019	$	66,897
Change in the fair value of contingent consideration		(22,600	)
Payment received for contingent consideration		(5,000	)
Impairment of corporate debt security		(492	)
Decrease in the fair value of warrants		(433	)
Balance, March 31, 2019	$	38,372

The Company’s investments in U.S. government and agency debt securities, international government agency debt securities and corporate debt securities classified as Level 2 within the fair value hierarchy were initially valued at the transaction price and subsequently valued, at the end of each reporting period, utilizing market-observable data. The market-observable data included reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. The Company validated the prices developed using the market-observable data by obtaining market values from other pricing sources, analyzing pricing data in certain instances and confirming that the relevant markets are active.

The Company’s contingent consideration relates to the divestiture of its Gainesville, GA facility in March 2015 (the “Gainesville Transaction”). On December 20, 2018, the Company entered into a Second Amendment to the Purchase and Sale Agreement (“Purchase and Sale Agreement Amendment”) with Recro Pharma, Inc. (“Recro”), pursuant to which the Company received one $5.0 million payment in the first quarter of 2019 and will receive another $5.0 million payment in the second quarter of 2019; the Company is eligible to receive low double-digit royalties on net sales of IV/IM and parenteral forms of Meloxicam and any other Meloxicam Product(s); and is eligible to receive up to $130.0 million in milestone payments upon the achievement of certain regulatory and sales milestones related to the Meloxicam Products.

In accordance with the accounting standard for fair value measurements, the Company’s contingent consideration has been classified as a Level 3 asset as its fair value is based on significant inputs not observable in the market. The fair value of the contingent consideration at March 31, 2019 was determined as follows:

•

The Company received $5.0 million in the first quarter of 2019 and expects to receive another $5.0 million in the second quarter of 2019; the Company is entitled to receive $5.0 million upon regulatory approval of a New Drug Application (“NDA”) for the first Meloxicam Product; and $45.0 million in seven equal, annual installments beginning on the first anniversary of such approval. The fair value of the regulatory milestone was estimated based on applying the likelihood of achieving the regulatory milestone and applying a discount rate from the expected time the milestone occurs to the balance sheet date. The Company expects the regulatory milestone event to occur in the first quarter of 2020 and used a discount rate of 16.0%;

•

The Company is entitled to receive future royalties on net sales of Meloxicam Products. To estimate the fair value of the future royalties, the Company assessed the likelihood of a Meloxicam Product being approved for sale and estimated the expected future sales given approval and IP protection. These expected payments were then discounted using a discount rate of 16.0%, which the Company believes captures a market participant’s view of the risk associated with the expected payments; and

•

The Company is entitled to receive payments of up to $80.0 million upon achieving certain sales milestones on future sales of the Meloxicam Products. The sales milestones were determined through the use of a real options approach, where net sales are simulated in a risk-neutral world. To employ this methodology, the Company used a risk-adjusted expected growth rate based on its assessments of expected growth in net sales of the approved Meloxicam Product, adjusted by an appropriate factor capturing their respective correlation with the

market. A resulting expected (probability-weighted) milestone payment was then discounted at a cost of debt of 15.0%.

Significant judgment was employed in determining the appropriateness of these assumptions at the acquisition date and for each subsequent period. Accordingly, changes in assumptions described above could have a material impact on the increase or decrease in the fair value of contingent consideration recorded in any given period.

In March 2019, Recro received a second complete response letter (“CRL”) from the U.S. Food and Drug Administration (“FDA”) regarding its NDA for IV Meloxicam. As a result of Recro’s receipt of this second CRL, the Company delayed its anticipated date for the FDA’s approval of the IV Meloxicam NDA and reduced the probability of success and amount of forecasted sales due to this delay in our valuation model. At March 31, 2019 and December 31, 2018, the Company determined that the value of the contingent consideration was $37.6 million and $65.2 million, respectively. The Company recorded a decrease of $22.6 million and $1.9 million during the three months ended March 31, 2019 and 2018, respectively, within “Change in the fair value of contingent consideration” in the accompanying condensed consolidated statements of operations and comprehensive loss.

The carrying amounts reflected in the condensed consolidated balance sheets for cash and cash equivalents, accounts receivable, other current assets, accounts payable and accrued expenses approximate fair value due to their short-term nature.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventory

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventory

6. INVENTORY

Inventory is stated at the lower of cost and net realizable value. Cost is determined using the first-in, first-out method. Inventory consisted of the following:

	March 31,		December 31,
(In thousands)	2019		2018
Raw materials	$	33,526	$	31,824
Work in process		41,548		38,019
Finished goods⁽¹⁾		17,787		20,353
Total inventory	$	92,861	$	90,196

(1)	At March 31, 2019 and December 31, 2018, the Company had $11.7 million and $11.0 million, respectively, of finished goods inventory located at its third-party warehouse and shipping service provider.

Property, Plant and Equipment

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

Property, Plant and Equipment

7. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following:

	March 31,			December 31,
(In thousands)	2019			2018
Land	$	6,560		$	6,486
Building and improvements		170,289			157,053
Furniture, fixtures and equipment		320,882			314,831
Leasehold improvements		20,105			20,105
Construction in progress		89,245			88,983
Subtotal		607,081			587,458
Less: accumulated depreciation		(287,077	)		(277,471	)
Total property, plant and equipment, net	$	320,004		$	309,987

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

8. GOODWILL AND INTANGIBLE ASSETS

Goodwill and intangible assets consisted of the following:

		March 31, 2019
(In thousands)	Weighted Amortizable Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Goodwill		$	92,873	$	—		$	92,873
Finite-lived intangible assets:
Collaboration agreements	12	$	465,590	$	(326,532	)	$	139,058
NanoCrystal technology	13		74,600		(40,873	)		33,727
OCR technologies	12		42,560		(34,296	)		8,264
Total		$	582,750	$	(401,701	)	$	181,049

Based on the Company’s most recent analysis, amortization of intangible assets included within its condensed consolidated balance sheet at March 31, 2019 is expected to be approximately $40.0 million, $40.0 million, $40.0 million, $35.0 million and $35.0 million in the years ending December 31, 2019 through 2023, respectively. Although the Company believes such available information and assumptions are reasonable, given the inherent risks and uncertainties underlying its expectations regarding such future revenues, there is the potential for the Company’s actual results to vary significantly from such expectations. If revenues are projected to change, the related amortization of the intangible assets will change in proportion to the change in revenues.

Leases

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Leases

9. LEASES

The Company adopted Topic 842 on January 1, 2019. Topic 842 allows the Company to elect a package of practical expedients, which include: (i) an entity need not reassess whether any expired or existing contracts are or contain leases; (ii) an entity need not reassess the lease classification for any expired or existing leases; and (iii) an entity need not reassess any initial direct costs for any existing leases. Another practical expedient allows the Company to use hindsight in determining the lease term when considering lessee options to extend or terminate the lease and to purchase the underlying asset. The Company has elected to utilize this package of practical expedients and has not elected the hindsight methodology in its implementation of Topic 842.

The Company elected to adopt this standard using the optional modified retrospective transition method and recognized a cumulative-effect adjustment to the condensed consolidated balance sheet on the date of adoption. Comparative periods have not been restated. With the adoption of Topic 842, the Company’s condensed consolidated balance sheet now contains the following line items: Right-of-use assets, Operating lease liabilities—short-term and Operating lease liabilities—long-term.

The Company determined that it held the following significant operating leases of office and laboratory space as of January 1, 2019:

•

An operating lease for 175,000 square feet of office and laboratory space in Waltham, Massachusetts that expires in 2021, with an option to extend the term for up to two five-year periods;

•

An operating lease for 67,000 square feet of office space in Waltham, Massachusetts that expires in 2020, with an option to extend the term for up to two one-year periods;

•

An operating lease for 14,600 square feet of office space in Dublin, Ireland that expires in 2022, with an option to extend the term for an additional five-year period; and

•

An operating lease for 7,000 square feet of corporate office and administrative space in Washington, D.C. that expires in 2029 and includes an option to extend the term for an additional five-year period.

The Company also has two additional operating leases that are included in its lease accounting but are not considered significant.

The Company has elected to not recognize right-of-use assets and lease liabilities arising from short-term leases, which are leases that, at the commencement date, have a lease term of 12 months or less and do not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise.

As all the existing leases subject to the new lease standard were previously classified as operating leases by the Company, they were similarly classified as operating leases under the new standard. The Company has determined that the identified operating leases did not contain non-lease components and require no further allocation of the total lease cost. Additionally, the agreements in place did not contain information to determine the rate implicit in the leases. As such, the Company calculated the incremental borrowing rate based on the assumed remaining lease term for each lease in order to calculate the present value of the remaining lease payments. At March 31, 2019, the weighted average incremental borrowing rate and the weighted average remaining lease term for the operating leases held by the Company were 4.46% and 4.1 years, respectively.

As of March 31, 2019, right-of-use assets and liabilities arising from operating leases were $18.0 million and $19.8 million, respectively. During the three months ended March 31, 2019, cash paid for amounts included for the measurement of lease liabilities was $2.3 million and the Company recorded operating lease expense of $2.1 million.

Future lease payments under non-cancelable leases as of March 31, 2019 and December 31, 2018:

	March 31,			December 31,
(In thousands)	2019			2018
2019	$	6,806		$	9,394
2020		8,652			10,717
2021		2,520			4,706
2022		500			2,455
2023		509			2,389
Thereafter		3,100			23,940
Total lease payments	$	22,087		$	53,601
Less: imputed interest		(2,272	)		—
Total operating lease liabilities	$	19,815		$	53,601

In March 2018, the Company entered into a lease agreement for approximately 220,000 square feet of office and laboratory space located in a building that is being built at 900 Winter Street, Waltham, Massachusetts (“900 Winter Street”). The Company plans to occupy the premises in early 2020. The initial term of the lease shall commence on the earlier of: (i) the Delivery Date (defined as (a) the later of January 20, 2020, or (b) the date on which the landlord substantially completes its work in accordance with the terms of the lease), or (ii) the date the Company enters into possession of all or any substantial portion of 900 Winter Street for the conduct of its business (the “Commencement Date”). The initial lease term expires on the last day of the calendar month in which the fifteenth (15^th) anniversary of the Commencement Date occurs, with an option to extend for an additional ten (10) years.

As the Company (a) does not have the right to obtain or control the leased premises during the construction period; (b) does not have the right of payment for the partially constructed assets and, thus, could be potentially leased to another tenant; and (c) does not legally own or control the land on which the property improvements are being constructed, it was not included as a right-of-use asset at March 31, 2019. Additionally, the future lease payments, outlined above, included the 900 Winter Street payments as of December 31, 2018; these payments are not included in the table under Topic 842.

Accounts Payable and Accrued Expenses

3 Months Ended

Mar. 31, 2019

Payables And Accruals [Abstract]

Accounts Payable and Accrued Expenses

10. ACCOUNTS PAYABLE AND ACCRUED EXPENSES

Accounts payable and accrued expenses consisted of the following:

	March 31,		December 31,
(In thousands)	2019		2018
Accounts payable	$	48,956	$	39,767
Accrued compensation		48,653		67,613
Accrued sales discounts, allowances and reserves		140,736		152,911
Accrued other		75,624		73,471
Total accounts payable and accrued expenses	$	313,969	$	333,762

Long-term Debt

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Long-term Debt

11. LONG-TERM DEBT

Long-term debt consisted of the following:

	March 31,			December 31,
(In thousands)	2019			2018
2023 Term Loans, due March 26, 2023	$	278,766		$	279,308
Less: current portion		(2,843	)		(2,843	)
Long-term debt	$	275,923		$	276,465

In March 2018, the Company amended and refinanced its existing term loan, referred to as Term Loan B-1 (as so amended and refinanced, the “2023 Term Loans”), in order to, among other things, extend the due date of the loan from September 25, 2021 to March 26, 2023, reduce the interest payable from LIBOR plus 2.75% with a LIBOR floor of 0.75% to LIBOR plus 2.25% with a 0% LIBOR floor and increase covenant flexibility (the “Refinancing”).

The Refinancing involved multiple lenders who were considered members of a loan syndicate. In determining whether the Refinancing was to be accounted for as a debt extinguishment or a debt modification, the Company considered whether creditors remained the same or changed and whether the changes in debt terms were substantial. A change in the debt terms was considered to be substantial if the present value of the remaining cash flows under the new terms of the 2023 Term Loans was at least 10% different from the present value of the remaining cash flows under the former Term Loan B-1 (commonly referred to as the “10% Test”). The Company performed a separate 10% Test for each individual creditor participating in the loan syndication. With the exception of one lender, who owned 1% of the total outstanding principal amount of Term Loan B-1 at the date of the Refinancing and was accounted for as a debt extinguishment, the Refinancing was accounted for as a debt modification.

The Refinancing resulted in a $2.3 million charge in the three months ended March 31, 2018, which was included in “Interest expense” in the accompanying condensed consolidated statement of operations and comprehensive loss.

The estimated fair value of the 2023 Term Loans, which was based on quoted market price indications (Level 2 in the fair value hierarchy, as described in Note 5, Fair Value Measurements, above) and which may not be representative of actual values that could have been, or will be, realized in the future, was $277.5 million and $274.7 million at March 31, 2019 and December 31, 2018, respectively.

Share-based Compensation

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based Compensation

12. SHARE-BASED COMPENSATION

Share-based compensation expense consisted of the following:

	March 31,
(In thousands)	2019		2018
Cost of goods manufactured and sold	$	1,978	$	1,418
Research and development		7,746		6,714
Selling, general and administrative		14,892		11,910
Total share-based compensation expense	$	24,616	$	20,042

At March 31, 2019 and December 31, 2018, $2.9 million and $2.7 million, respectively, of share-based compensation cost was capitalized and recorded as “Inventory” in the accompanying condensed consolidated balance sheets.

In February 2017, the compensation committee of the Company’s board of directors approved awards of restricted stock units (“RSUs”) to all employees employed by the Company during 2017, in each case subject to vesting on the achievement of the following performance criteria: (i) FDA approval of the NDA for ALKS 5461, (ii) the achievement of the pre-specified primary efficacy endpoints in each of two phase 3 studies of ALKS 3831, and (iii) revenues equal to or greater than a pre-specified amount for the year ending December 31, 2019. These performance criteria are being assessed over a performance period of three years from the date of the grant.

In December 2018, the Company achieved the pre-specified primary efficacy endpoints on its second of the two phase 3 studies of ALKS 3831, resulting in the vesting of a portion of the performance-based RSUs and the recognition

of $17.1 million in share-based compensation expense related to these awards. The Company recognized $2.1 million, $6.7 million and $8.3 million of this expense in cost of goods manufactured and sold; R&D expense; and SG&A expense, respectively.

At March 31, 2019, there was $33.2 million of unrecognized compensation cost related to the remaining unvested portion of the performance-based RSUs, which would be recognized in accordance with the terms of the award if and when the Company deems it probable that the performance criteria will be met. The unvested portion of the awards will expire if the performance conditions have not been met on or before the three-year anniversary of the grant date.

Loss Per Share

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Loss Per Share

13. LOSS PER SHARE

Basic loss per ordinary share is calculated based upon net loss available to holders of ordinary shares divided by the weighted average number of shares outstanding. For the three months ended March 31, 2019 and 2018, as the Company was in a net loss position, the diluted loss per share calculation did not assume conversion or exercise of stock options and awards as they would have had an anti-dilutive effect on loss per share.

The following potential ordinary equivalent shares have not been included in the net loss per ordinary share calculation because the effect would have been anti-dilutive:

	Three Months Ended
	March 31,
(In thousands)	2019		2018
Stock options		12,522		10,217
Restricted stock units		2,232		2,808
Total		14,754		13,025

Commitments and Contingent Liabilities

3 Months Ended

Mar. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

14. COMMITMENTS AND CONTINGENT LIABILITIES

Litigation

From time to time, the Company may be subject to legal proceedings and claims in the ordinary course of business. On a quarterly basis, the Company reviews the status of each significant matter and assesses its potential financial exposure. If the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated, the Company would accrue a liability for the estimated loss. Because of uncertainties related to claims and litigation, accruals are based on the Company’s best estimates, utilizing all available information. On a periodic basis, as additional information becomes available, or based on specific events such as the outcome of litigation or settlement of claims, the Company may reassess the potential liability related to these matters and may revise these estimates, which could result in material adverse adjustments to the Company’s operating results. At March 31, 2019, there were no potential material losses from claims, asserted or unasserted, or legal proceedings the Company determined were probable of occurring.

INVEGA SUSTENNA ANDA Litigation

In January 2018, Janssen Pharmaceuticals NV and Janssen Pharmaceuticals, Inc. initiated a patent infringement lawsuit in the United States District Court for the District of New Jersey against Teva Pharmaceuticals USA, Inc. (“Teva”), who filed an abbreviated new drug application (“ANDA”) seeking approval to market a generic version of INVEGA SUSTENNA before the expiration of U.S. Patent No. 9,439,906. Requested judicial remedies included recovery of litigation costs and injunctive relief. The Company is not a party to these proceedings.

For information about risks relating to the INVEGA SUSTENNA Paragraph IV litigation, see “Part I, Item 1A—Risk Factors” of the Company’s Annual Report, including the section entitled “—We or our licensees may face claims against intellectual property rights covering our products and competition from generic drug manufacturers.”

AMPYRA ANDA Litigation

Eleven separate Paragraph IV Certification Notices have been received by the Company and/or its partner Acorda from: Accord Healthcare, Inc. (“Accord”); Actavis Laboratories FL, Inc. (“Actavis”); Alkem Laboratories Ltd.

(“Alkem”); Apotex Corporation and Apotex, Inc. (collectively, “Apotex”); Aurobindo Pharma Ltd. (“Aurobindo”); MicroLabs Limited (“MicroLabs”); Mylan Pharmaceuticals, Inc. (“Mylan”); Par Pharmaceutical, Inc. (“Par”); Roxane Laboratories, Inc. (“Roxane”); Sun Pharmaceutical Industries Limited and Sun Pharmaceuticals Industries Inc. (collectively, “Sun”); and Teva (collectively with Accord, Actavis, Alkem, Apotex, Aurobindo, MicroLabs, Mylan, Par, Roxane and Sun, the “ANDA Filers”) advising that each of the ANDA Filers had submitted an ANDA to the FDA seeking marketing approval for generic versions of AMPYRA (dalfampridine) Extended-Release Tablets, 10 mg. The ANDA Filers challenged the validity of one or more of the Orange Book-listed patents for AMPYRA, and they also asserted that their generic versions do not infringe certain claims of these patents. In response, the Company and/or Acorda filed lawsuits against the ANDA Filers asserting infringement of one or more of the Orange Book-listed patents for AMPYRA. Requested judicial remedies included recovery of litigation costs and injunctive relief.

All lawsuits were filed within 45 days from the date of receipt of each of the Paragraph IV Certification Notices from the ANDA Filers. As a result, a 30-month statutory stay of approval period applied to each of the ANDA Filers’ ANDAs under the U.S. Drug Price Competition and Patent Term Restoration Act of 1984 (the “Hatch-Waxman Act”). The first 30-month stay restricted the FDA from approving the ANDA Filers’ ANDAs until July 2017 at the earliest, unless a Federal district court issued a decision adverse to all of the asserted Orange Book-listed patents prior to that date. Lawsuits with eight of the ANDA Filers were consolidated into a single case.

The Company and/or Acorda entered into a settlement agreement with each of Accord, Actavis, Alkem, Apotex, Aurobindo, MicroLabs, Par and Sun to resolve the patent litigation that the Company and/or Acorda brought against these settling ANDA Filers. The settlements with these settling ANDA Filers did not impact the patent litigation that the Company and Acorda brought against the remaining ANDA Filers, including as described below.

In March 2017, after a bench trial, the U.S. District Court for the District of Delaware (the “Delaware Court”) issued an opinion (the “Delaware Court Decision”), which, among other things, invalidated U.S. Patent Nos. 8,007,826; 8,354,437; 8,440,703; and 8,663,685. The Delaware Court also upheld the validity of the U.S. Patent No. 5,540,938 which pertained to the formulation of AMPYRA, but that patent expired on July 30, 2018. In May 2017, Acorda filed an appeal with the Federal Circuit of the Delaware Court Decision with respect to the findings on U.S. Patent Nos. 8,007,826; 8,354,437; 8,440,703; and 8,663,685. On July 27, 2018, Acorda and the Company entered into a settlement agreement with Mylan, pursuant to which, among other things, Mylan was permitted to market an authorized generic version of AMPYRA in the U.S. in the event of an affirmance by the Federal Circuit of the Delaware Court Decision. On September 10, 2018, the Federal Circuit affirmed the Delaware Court Decision, which invalidated U.S. Patent Nos. 8,007,826; 8,354,437; 8,440,703; and 8,663,685. On October 24, 2018, Acorda filed a petition for rehearing and rehearing en banc of the Federal Circuit’s decision. On January 4, 2019, the Federal Circuit denied Acorda’s petition. On April 4, 2019, Acorda filed a petition for writ of certiorari to the Supreme Court of the United States.

For information about risks relating to the AMPYRA Paragraph IV litigations and other proceedings see “Part I, Item 1A—Risk Factors” of the Company’s Annual Report, including the section entitled “—We or our licensees may face claims against intellectual property rights covering our products and competition from generic drug manufacturers.”

VIVITROL IPR Proceeding

On April 20, 2018, Amneal Pharmaceuticals LLC filed a petition with the Patent Trial and Appeal Board (the “PTAB”) of the U.S. Patent and Trademark Office seeking an inter partes review (“IPR”) of U.S. Patent Number 7,919,499 (the “ ‘499 Patent”), which is an Orange Book-listed patent for VIVITROL, seeking cancellation of claims 1-13 of the ’499 Patent. On November 7, 2018, the PTAB issued an order instituting an IPR of all challenged claims. On February 7, 2019, the Company filed its patent owner’s response. Amneal’s reply is due on May 7, 2019. A decision on the matter is expected by November 7, 2019. The Company will vigorously defend the ’499 Patent in the IPR proceedings. For information about risks relating to the ’499 Patent IPR proceedings see “Part I, Item 1A—Risk Factors” in the Company’s Annual Report, including the sections entitled “— Patent protection for our products is important and uncertain” and “— Uncertainty over intellectual property in the biopharmaceutical industry has been the source of litigation, which is inherently costly and unpredictable, could significantly delay or prevent approval or commercialization of our products, and could adversely affect our business.”

RISPERDAL CONSTA European Opposition Proceedings

In December 2016, Nanjing Luye Pharmaceutical Co Ltd, Pharmathen SA, Teva Pharmaceutical Industries Ltd and Dehns Ltd (a law firm representing an unidentified opponent) filed notices of opposition with the European Patent Office (the “EPO”) in respect of EP 2 269 577 B (the “EP ’577” Patent), which is a patent directed to certain risperidone microsphere compositions, including RISPERDAL CONSTA. Following a hearing on the matter on January 23, 2019, on April 8, 2019, the EPO issued a written decision revoking the EP’577 Patent. The Company has approximately two months from the date of the decision to appeal the decision to the EPO’s Technical Boards of Appeal. The Company will continue to vigorously defend the EP ’577 Patent. For information about risks relating to the EP ’577 Patent opposition proceedings see “Part I, Item 1A—Risk Factors” of the Company’s Annual Report, including the sections entitled “— Patent protection for our products is important and uncertain” and “— Uncertainty over intellectual property in the biopharmaceutical industry has been the source of litigation, which is inherently costly and unpredictable, could significantly delay or prevent approval or commercialization of our products, and could adversely affect our business.”

Government Matters

On June 22, 2017 and January 17, 2019, the Company received a subpoena and a civil investigative demand, respectively, each from an Office of the U.S. Attorney for documents related to VIVITROL. The Company is cooperating with the government.

Securities Litigation

On November 22, 2017, a purported stockholder of the Company filed a putative class action against the Company and certain of its officers (collectively, “Defendants”) in the United States District Court for the Southern District of New York captioned Gagnon v. Alkermes plc, et al., No. 1:17-cv-09178. This complaint was amended twice since its initial filing. The second amended complaint was filed on behalf of a putative class of purchasers of Alkermes securities during the period of February 24, 2015 through November 14, 2017 and alleged violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, based on allegedly false or misleading statements and omissions regarding the Company’s marketing practices related to VIVITROL. The lawsuit sought, among other things, unspecified damages for alleged inflation in the price of securities, and reasonable costs and expenses, including attorneys’ fees. On June 29, 2018, Defendants filed a motion to dismiss the second amended complaint. On March 28, 2019, the United States District Court for the Southern District of New York issued an order granting Defendants’ motion to dismiss and dismissing the case in its entirety and with prejudice. On April 11, 2019, the lead plaintiff filed a motion for reconsideration. Briefing on the motion for reconsideration will be completed on May 2, 2019. For information about risks relating to this action, see “Part I, Item 1A—Risk Factors” of the Company’s Annual Report, including the section entitled “—Litigation or arbitration against Alkermes, including securities litigation, or citizen petitions filed with the FDA, may result in financial losses, harm our reputation, divert management resources, negatively impact the approval of our products, or otherwise negatively impact our business.”

On December 27, 2018, a purported stockholder of the Company filed a putative class action against the Company and certain of its officers in the United States District Court for the Eastern District of New York captioned Karimian v. Alkermes plc, et al., No. 1:18-cv-07410. On January 31, 2019, a purported stockholder of the Company filed a similar putative class action against the Company and the same officers in the United States District Court for the Eastern District of New York captioned McDermott v. Alkermes plc, et al., No. 1:19-cv-00624. These complaints were filed on behalf of putative classes of purchasers of Alkermes securities during the period of February 17, 2017 through November 1, 2018 and allege violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, based on allegedly false or misleading statements and omissions regarding the Company’s regulatory submission for ALKS 5461 and the FDA’s review and consideration of that submission. The lawsuits seek, among other things, unspecified money damages, prejudgment and postjudgment interest, reasonable attorneys’ fees, expert fees and other costs. On March 12, 2019, the United States District Court for the Eastern District of New York consolidated the two cases and appointed a lead plaintiff. For information about risks relating to these actions, see “Part I, Item 1A—Risk Factors” of the Company’s Annual Report, including the section entitled “—Litigation or arbitration against Alkermes, including securities litigation, or citizen petitions filed with the FDA, may result in financial losses, harm our reputation, divert management resources, negatively impact the approval of our products, or otherwise negatively impact our business.”

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements of the Company for the three months ended March 31, 2019 and 2018 are unaudited and have been prepared on a basis substantially consistent with the audited financial statements for the year ended December 31, 2018. The year-end condensed consolidated balance sheet data, which is presented for comparative purposes, was derived from audited financial statements, but does not include all disclosures required by accounting principles generally accepted in the United States (“U.S.”) (commonly referred to as “GAAP”). In the opinion of management, the condensed consolidated financial statements include all adjustments, which are of a normal recurring nature, that are necessary to state fairly the results of operations for the reported periods. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto of the Company, which are contained in the Company’s Annual Report that has been filed with the SEC. The results of the Company’s operations for any interim period are not necessarily indicative of the results of the Company’s operations for any other interim period or for a full fiscal year.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of Alkermes plc and its wholly-owned subsidiaries as disclosed in Note 2, Summary of Significant Accounting Policies, in the “Notes to Consolidated Financial Statements” accompanying the Annual Report. Intercompany accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates The preparation of the Company’s condensed consolidated financial statements in accordance with GAAP requires management to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, judgments and methodologies, including those related to revenue recognition and related allowances, its collaborative relationships, clinical trial expenses, the valuation of inventory, impairment and amortization of intangibles and long-lived assets, share-based compensation, income taxes including the valuation allowance for deferred tax assets, valuation of investments, contingent consideration and litigation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions or conditions.
Segment Information	Segment Information The Company operates as one business segment, which is the business of developing, manufacturing and commercializing medicines. The Company’s chief decision maker, the Chairman of the Board and Chief Executive Officer, reviews the Company’s operating results on an aggregate basis and manages the Company’s operations as a single operating unit.
Income Taxes	Income Taxes The Company’s income tax benefit in the three months ended March 31, 2019 and 2018 primarily related to U.S. federal and state taxes. The Company records a deferred tax asset or liability based on the difference between the financial statement and tax basis of its assets and liabilities, as measured by enacted jurisdictional tax rates assumed to be in effect when these differences reverse. At March 31, 2019, the Company maintained a valuation allowance against certain of its U.S. and foreign deferred tax assets. The Company evaluates, at each reporting period, the need for a valuation allowance on its deferred tax assets on a jurisdiction-by-jurisdiction basis.
New Accounting Pronouncements	New Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard-setting bodies that are adopted by the Company as of the specified effective date. Unless otherwise discussed, the Company believes that the impact of recently issued guidance that are not yet effective will not have a material impact on its financial position or results of operations upon adoption. Effective January 1, 2019, the Company adopted the requirements under Accounting Standards Update (“ASU”) 2016-02, Leases (“Topic 842”) using the optional modified retrospective transition method and recognized a cumulative-effect adjustment to the condensed consolidated balance sheet on the date of adoption. Comparative periods have not been restated. Topic 842 was issued in order to increase transparency and comparability among organizations by recognizing right-of-use lease assets and operating lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between previous GAAP (“Topic 840”) and Topic 842 is the recognition of right-of-use lease assets and lease liabilities by lessees for those leases classified as operating leases under Topic 840. At January 1, 2019, the Company recorded a right-of-use asset of $20.1 million and an operating lease liability of $22.1 million. For additional information regarding how the Company is accounting for leases under Topic 842, refer to Note 9, Leases, in the “Notes to Condensed Consolidated Financial Statements” in this Form 10-Q. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments, to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. To achieve this objective, the amendments in this ASU replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. This ASU becomes effective for the Company in the year ending December 31, 2020, with early adoption permitted for the Company in the year ending December 31, 2019. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements. In June 2018, the FASB issued ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting, which addresses the accounting for nonemployee share-based payment transactions resulting from expanding the scope of Topic 718, Compensation – Stock Compensation, to include share-based payment transactions for acquiring goods and services from nonemployees. This ASU became effective for and was adopted by the Company in the year ending December 31, 2019 and the adoption of the ASU did not have an impact on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-14, Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement, which aims to improve the effectiveness of fair value measurement disclosures. The amendments in this ASU modify the disclosure requirements on fair value measurements based on the concepts in FASB Concepts Statement, Conceptual Framework for Financial Reporting - Chapter 8: Notes to Financial Statements, including the consideration of costs and benefits. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). This ASU also requires the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements. In November 2018, the FASB issued ASU 2018-18, Clarifying the Interaction Between Topic 808 and Topic 606, which clarifies when transactions between participants in a collaborative arrangement are within the scope of the FASB’s revenue standard, Topic 606. This ASU becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this ASU will have on its consolidated financial statements.

- Definition

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.

+ References + Details

Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2019

Schedule of Manufacturing and Royalty Revenues

During the three months ended March 31, 2019 and 2018, the Company recorded manufacturing and royalty revenues as follows:

	Three Months Ended March 31, 2019
(In thousands)	Manufacturing Revenue		Royalty Revenue		Total
INVEGA SUSTENNA/XEPLION & INVEGA TRINZA/TREVICTA	$	—	$	53,298	$	53,298
RISPERDAL CONSTA		17,921		4,385		22,306
AMPYRA/FAMPYRA		5,680		6,506		12,186
Other		7,346		13,779		21,125
	$	30,947	$	77,968	$	108,915

	Three Months Ended March 31, 2018
(In thousands)	Manufacturing Revenue		Royalty Revenue		Total
INVEGA SUSTENNA/XEPLION & INVEGA TRINZA/TREVICTA	$	—	$	46,086	$	46,086
AMPYRA/FAMPYRA		13,563		14,696		28,259
RISPERDAL CONSTA		17,792		4,912		22,704
Other		6,236		11,316		17,552
	$	37,591	$	77,010	$	114,601

Schedule of Contract Assets and Contract Liabilities

Contract assets consisted of the following:

(In thousands)	Contract Assets
Contract assets at January 1, 2019	$	8,230
Additions		7,346
Transferred to receivables, net		(7,129	)
Contract assets at March 31, 2019	$	8,447

Contract Liabilities—Contract liabilities consist of contractual obligations related to deferred revenue.

Contract liabilities consisted of the following:

(In thousands)	Contract Liabilities
Contract liabilities at January 1, 2019	$	12,694
Additions		1,516
Amounts recognized into revenue		(790	)
Contract liabilities at March 31, 2019	$	13,420

Product sales, net

Schedule of Disaggregation of Revenue

During the three months ended March 31, 2019 and 2018, the Company recorded product sales, net, as follows:

	Three Months Ended March 31,
(In thousands)	2019		2018
VIVITROL	$	69,183	$	62,682
ARISTADA		30,298		29,160
Total product sales, net	$	99,481	$	91,842

Investments (Tables)

3 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

Investments consisted of the following (in thousands):

			Gross Unrealized
					Losses
	Amortized				Less than			Greater than			Estimated
March 31, 2019	Cost		Gains		One Year			One Year			Fair Value
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	156,443	$	349	$	(11	)	$	(149	)	$	156,632
U.S. government and agency debt securities		108,113		257		(4	)		(45	)		108,321
International government agency debt securities		91,818		193		—			(70	)		91,941
Total short-term investments		356,374		799		(15	)		(264	)		356,894
Long-term investments:
Available-for-sale securities:
Corporate debt securities		28,570		—		(84	)		(45	)		28,441
U.S. government and agency debt securities		10,984		—		(4	)		(5	)		10,975
		39,554		—		(88	)		(50	)	$	39,416
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Fixed term deposit account		1,667		102		—			—			1,769
		3,487		102		—			—			3,589
Total long-term investments		43,041		102		(88	)		(50	)		43,005
Total investments		399,415		901		(103	)		(314	)		399,899

December 31, 2018
Short-term investments:
Available-for-sale securities:
Corporate debt securities	$	120,197	$	57	$	(62	)	$	(274	)	$	119,918
U.S. government and agency debt securities		80,055		115		(11	)		(87	)		80,072
International government agency debt securities		72,091		85		(8	)		(117	)		72,051
		272,343		257		(81	)		(478	)		272,041
Held-to-maturity securities:
Corporate debt securities		492		—		—			—			492
Total short-term investments		272,835		257		(81	)		(478	)		272,533
Long-term investments:
Available-for-sale securities:
Corporate debt securities		53,505		—		(185	)		(93	)	$	53,227
U.S. government and agency debt securities		18,474		—		(21	)		(12	)		18,441
International government agency debt securities		5,457		—		(4	)		—			5,453
		77,436		—		(210	)		(105	)		77,121
Held-to-maturity securities:
Certificates of deposit		1,820		—		—			—			1,820
Fixed term deposit account		1,667		136		—			—			1,803
		3,487		136		—			—			3,623
Total long-term investments		80,923		136		(210	)		(105	)		80,744
Total investments	$	353,758	$	393	$	(291	)	$	(583	)	$	353,277

Schedule of Proceeds From Sales and Maturities of Marketable Securities Plus the Resulting Realized Gains and Losses

The proceeds from the sales and maturities of marketable securities, which were identified using the specific identification method and were primarily reinvested, were as follows:

	Three Months Ended March 31,
(In thousands)	2019		2018
Proceeds from the sales and maturities of marketable securities	$	55,978	$	79,500
Realized gains	$	—	$	1
Realized losses	$	492	$	4

Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities

The Company’s available-for-sale and held-to-maturity securities at March 31, 2019 had contractual maturities in the following periods:

	Available-for-sale				Held-to-maturity
	Amortized		Estimated		Amortized		Estimated
(In thousands)	Cost		Fair Value		Cost		Fair Value
Within 1 year	$	213,318	$	213,172	$	1,820	$	1,820
After 1 year through 5 years		182,610		183,138		1,667		1,769
Total	$	395,928	$	396,310	$	3,487	$	3,589

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis

	March 31,
(In thousands)	2019		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	62,556	$	62,556	$	—	$	—
U.S. government and agency debt securities		119,296		68,704		50,592		—
Corporate debt securities		185,073		—		185,073		—
International government agency debt securities		91,941		—		91,941		—
Contingent consideration		37,600		—		—		37,600
Common stock warrants		772		—		—		772
Total	$	497,238	$	131,260	$	327,606	$	38,372

	December 31,
	2018		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	54,590	$	54,590	$	—	$	—
U.S. government and agency debt securities		98,513		60,107		38,406		—
Corporate debt securities		173,637		—		173,145		492
International government agency debt securities		77,504		—		77,504		—
Contingent consideration		65,200		—		—		65,200
Common stock warrants		1,205		—		—		1,205
Total	$	470,649	$	114,697	$	289,055	$	66,897

Rollforward of the Fair Value of the Assets Determined using Level 3 Inputs

The following table is a rollforward of the fair value of the Company’s assets whose fair values were determined using Level 3 inputs at March 31, 2019:

(In thousands)	Fair Value
Balance, January 1, 2019	$	66,897
Change in the fair value of contingent consideration		(22,600	)
Payment received for contingent consideration		(5,000	)
Impairment of corporate debt security		(492	)
Decrease in the fair value of warrants		(433	)
Balance, March 31, 2019	$	38,372

Inventory (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventory is stated at the lower of cost and net realizable value. Cost is determined using the first-in, first-out method. Inventory consisted of the following:

	March 31,		December 31,
(In thousands)	2019		2018
Raw materials	$	33,526	$	31,824
Work in process		41,548		38,019
Finished goods⁽¹⁾		17,787		20,353
Total inventory	$	92,861	$	90,196

(1)	At March 31, 2019 and December 31, 2018, the Company had $11.7 million and $11.0 million, respectively, of finished goods inventory located at its third-party warehouse and shipping service provider.

Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2019

Property Plant And Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment consisted of the following:

	March 31,			December 31,
(In thousands)	2019			2018
Land	$	6,560		$	6,486
Building and improvements		170,289			157,053
Furniture, fixtures and equipment		320,882			314,831
Leasehold improvements		20,105			20,105
Construction in progress		89,245			88,983
Subtotal		607,081			587,458
Less: accumulated depreciation		(287,077	)		(277,471	)
Total property, plant and equipment, net	$	320,004		$	309,987

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

Goodwill and intangible assets consisted of the following:

		March 31, 2019
(In thousands)	Weighted Amortizable Life (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Goodwill		$	92,873	$	—		$	92,873
Finite-lived intangible assets:
Collaboration agreements	12	$	465,590	$	(326,532	)	$	139,058
NanoCrystal technology	13		74,600		(40,873	)		33,727
OCR technologies	12		42,560		(34,296	)		8,264
Total		$	582,750	$	(401,701	)	$	181,049

Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Summary of Future Lease Payments Under Non-Cancelable Leases

Future lease payments under non-cancelable leases as of March 31, 2019 and December 31, 2018:

	March 31,			December 31,
(In thousands)	2019			2018
2019	$	6,806		$	9,394
2020		8,652			10,717
2021		2,520			4,706
2022		500			2,455
2023		509			2,389
Thereafter		3,100			23,940
Total lease payments	$	22,087		$	53,601
Less: imputed interest		(2,272	)		—
Total operating lease liabilities	$	19,815		$	53,601

Accounts Payable and Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2019

Payables And Accruals [Abstract]

Schedule of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following:

	March 31,		December 31,
(In thousands)	2019		2018
Accounts payable	$	48,956	$	39,767
Accrued compensation		48,653		67,613
Accrued sales discounts, allowances and reserves		140,736		152,911
Accrued other		75,624		73,471
Total accounts payable and accrued expenses	$	313,969	$	333,762

Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consisted of the following:

	March 31,			December 31,
(In thousands)	2019			2018
2023 Term Loans, due March 26, 2023	$	278,766		$	279,308
Less: current portion		(2,843	)		(2,843	)
Long-term debt	$	275,923		$	276,465

Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-based Compensation Expense

Share-based compensation expense consisted of the following:

	March 31,
(In thousands)	2019		2018
Cost of goods manufactured and sold	$	1,978	$	1,418
Research and development		7,746		6,714
Selling, general and administrative		14,892		11,910
Total share-based compensation expense	$	24,616	$	20,042

Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Schedule of Anti-Dilutive Potential Common Equivalent Shares Excluded from Calculation of Net (Loss) Income Per Share

The following potential ordinary equivalent shares have not been included in the net loss per ordinary share calculation because the effect would have been anti-dilutive:

	Three Months Ended
	March 31,
(In thousands)	2019		2018
Stock options		12,522		10,217
Restricted stock units		2,232		2,808
Total		14,754		13,025

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Number of business segments \| segment	1
Operating lease, right-of-use asset	$ 18,010	$ 20,100
Operating lease liability	$ 19,815	$ 22,100	$ 53,601

Revenue from Contracts with Customers - Schedule of Manufacturing and Royalty Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 223,102	$ 225,150
Manufacturing Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	30,947	37,591
Manufacturing Revenue \| AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	5,680	13,563
Manufacturing Revenue \| RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	17,921	17,792
Manufacturing Revenue \| Other
Disaggregation Of Revenue [Line Items]
Total revenues	7,346	6,236
Royalty Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	77,968	77,010
Royalty Revenue \| INVEGA SUSTENNA/XEPLION and INVEGA TRINZA/TREVICTA
Disaggregation Of Revenue [Line Items]
Total revenues	53,298	46,086
Royalty Revenue \| AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	6,506	14,696
Royalty Revenue \| RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	4,385	4,912
Royalty Revenue \| Other
Disaggregation Of Revenue [Line Items]
Total revenues	13,779	11,316
Manufacturing and royalty revenues
Disaggregation Of Revenue [Line Items]
Total revenues	108,915	114,601
Manufacturing and royalty revenues \| INVEGA SUSTENNA/XEPLION and INVEGA TRINZA/TREVICTA
Disaggregation Of Revenue [Line Items]
Total revenues	53,298	46,086
Manufacturing and royalty revenues \| AMPYRA/ FAMPYRA
Disaggregation Of Revenue [Line Items]
Total revenues	12,186	28,259
Manufacturing and royalty revenues \| RISPERDAL CONSTA
Disaggregation Of Revenue [Line Items]
Total revenues	22,306	22,704
Manufacturing and royalty revenues \| Other
Disaggregation Of Revenue [Line Items]
Total revenues	$ 21,125	$ 17,552

Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 223,102	$ 225,150
VIVITROL
Disaggregation Of Revenue [Line Items]
Total revenues	69,183	62,682
ARISTADA
Disaggregation Of Revenue [Line Items]
Total revenues	30,298	29,160
Product sales, net
Disaggregation Of Revenue [Line Items]
Total revenues	$ 99,481	$ 91,842

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Total revenues related to license and collaboration agreement for Diroximel fumarate	$ 223,102	$ 225,150
Minimum
Disaggregation Of Revenue [Line Items]
Manufacturing Process period	10 days
Maximum
Disaggregation Of Revenue [Line Items]
Manufacturing Process period	56 days
Biogen
Disaggregation Of Revenue [Line Items]
Total revenues related to license and collaboration agreement for Diroximel fumarate	$ 13,900	17,500
Research and development revenue
Disaggregation Of Revenue [Line Items]
Total revenues related to license and collaboration agreement for Diroximel fumarate	$ 14,706	$ 18,707
Research and development revenue \| Biogen \| Forecast
Disaggregation Of Revenue [Line Items]
Additional revenue expected			$ 77,600

Revenue from Contracts with Customers - Schedule of Contract Assets and Contract Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Contract Asset [Abstract]
Contract assets at beginning of period	$ 8,230
Additions	7,346
Transferred to receivables, net	(7,129)
Contract assets at end of period	8,447
Contract Liabilities [Abstract]
Contract liabilities at beginning of the period	12,694
Additions	1,516
Amounts recognized into revenue	(790)
Contract liabilities at end of the period	$ 13,420

Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available-for-sale securities:
Amortized Cost	$ 395,928
Estimated Fair Value	396,310
Held-to-maturity securities:
Estimated Fair Value	3,589
Long-term Investments
Amortized Cost	43,041	$ 80,923
Gross Unrealized Gains	102	136
Gross Unrealized Losses, Less than One Year	(88)	(210)
Gross Unrealized Losses, Greater than One Year	(50)	(105)
Total long-term investments	43,005	80,744
Total investments
Amortized Cost	399,415	353,758
Gross Unrealized Gains	901	393
Gross Unrealized Losses, Less than One Year	(103)	(291)
Gross Unrealized Losses, Greater than One Year	(314)	(583)
Estimated Fair Value	399,899	353,277
Short-term investments
Available-for-sale securities:
Amortized Cost	356,374	272,343
Gross Unrealized Gains	799	257
Gross Unrealized Losses, Less than One Year	(15)	(81)
Gross Unrealized Losses, Greater than One Year	(264)	(478)
Estimated Fair Value	356,894	272,041
Held-to-maturity securities:
Amortized Cost		272,835
Gross Unrealized Gains		257
Gross Unrealized Losses, Less than One Year		(81)
Gross Unrealized Losses, Greater than One Year		(478)
Estimated Fair Value		272,533
Short-term investments \| Corporate debt securities
Available-for-sale securities:
Amortized Cost	156,443	120,197
Gross Unrealized Gains	349	57
Gross Unrealized Losses, Less than One Year	(11)	(62)
Gross Unrealized Losses, Greater than One Year	(149)	(274)
Estimated Fair Value	156,632	119,918
Held-to-maturity securities:
Amortized Cost		492
Estimated Fair Value		492
Short-term investments \| U.S. government and agency debt securities
Available-for-sale securities:
Amortized Cost	108,113	80,055
Gross Unrealized Gains	257	115
Gross Unrealized Losses, Less than One Year	(4)	(11)
Gross Unrealized Losses, Greater than One Year	(45)	(87)
Estimated Fair Value	108,321	80,072
Short-term investments \| International government agency debt securities
Available-for-sale securities:
Amortized Cost	91,818	72,091
Gross Unrealized Gains	193	85
Gross Unrealized Losses, Less than One Year		(8)
Gross Unrealized Losses, Greater than One Year	(70)	(117)
Estimated Fair Value	91,941	72,051
Long-term investments
Available-for-sale securities:
Amortized Cost	39,554	77,436
Gross Unrealized Losses, Less than One Year	(88)	(210)
Gross Unrealized Losses, Greater than One Year	(50)	(105)
Estimated Fair Value	39,416	77,121
Held-to-maturity securities:
Amortized Cost	3,487	3,487
Gross Unrealized Gains	102	136
Estimated Fair Value	3,589	3,623
Long-term investments \| Certificates of deposit
Held-to-maturity securities:
Amortized Cost	1,820	1,820
Estimated Fair Value	1,820	1,820
Long-term investments \| Corporate debt securities
Available-for-sale securities:
Amortized Cost	28,570	53,505
Gross Unrealized Losses, Less than One Year	(84)	(185)
Gross Unrealized Losses, Greater than One Year	(45)	(93)
Estimated Fair Value	28,441	53,227
Long-term investments \| U.S. government and agency debt securities
Available-for-sale securities:
Amortized Cost	10,984	18,474
Gross Unrealized Losses, Less than One Year	(4)	(21)
Gross Unrealized Losses, Greater than One Year	(5)	(12)
Estimated Fair Value	10,975	18,441
Long-term investments \| International government agency debt securities
Available-for-sale securities:
Amortized Cost		5,457
Gross Unrealized Losses, Less than One Year		(4)
Estimated Fair Value		5,453
Long-term investments \| Fixed Term Deposit Account
Held-to-maturity securities:
Amortized Cost	1,667	1,667
Gross Unrealized Gains	102	136
Estimated Fair Value	$ 1,769	$ 1,803

Investments - Schedule of Proceeds From Sales and Maturities of Marketable Securities Plus the Resulting Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments Debt And Equity Securities [Abstract]
Proceeds from the sales and maturities of marketable securities	$ 55,978	$ 79,500
Realized gains		1
Realized losses	$ 492	$ 4

Investments - Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Available-for-sale, Amortized Cost
Within 1 year	$ 213,318
After 1 year through 5 years	182,610
Amortized Cost	395,928
Available-for-sale, Estimated Fair Value
Within 1 year	213,172
After 1 year through 5 years	183,138
Total	396,310
Held-to-maturity, Amortized Cost
Within 1 year	1,820
After 1 year through 5 years	1,667
Total	3,487
Held-to-maturity, Estimated Fair Value
Within 1 year	1,820
After 1 year through 5 years	1,769
Total	$ 3,589

Investments - Additional Information (Details) - Fountain Healthcare Partners II, LP of Ireland € in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Dec. 31, 2018 USD ($)	May 31, 2014 EUR (€)
Equity method investment
Funding commitment as percentage of partnership's total funding	7.00%		7.00%
Increase (decrease) in carrying value of investment of the entity, which represents the Company's share of investee's net gains (losses) \| $	$ (0.1)	$ (0.1)
Maximum
Equity method investment
Maximum commitment on equity method investment \| €					€ 7.4
Other Assets
Equity method investment
Total equity method commitment \| €			€ 5.5
Carrying value of equity investment \| $	$ 5.6			$ 5.5

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References + Details

Fair Value Measurements - Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair value
Debt securities	$ 396,310
Contingent consideration	37,600	$ 65,200
Recurring Basis
Fair value
Cash equivalents	62,556	54,590
Contingent consideration	37,600	65,200
Common stock warrants	772	1,205
Assets, Total	497,238	470,649
Recurring Basis \| Level 1
Fair value
Cash equivalents	62,556	54,590
Assets, Total	131,260	114,697
Recurring Basis \| Level 2
Fair value
Assets, Total	327,606	289,055
Recurring Basis \| Level 3
Fair value
Contingent consideration	37,600	65,200
Common stock warrants	772	1,205
Assets, Total	38,372	66,897
U.S. government and agency debt securities \| Recurring Basis
Fair value
Debt securities	119,296	98,513
U.S. government and agency debt securities \| Recurring Basis \| Level 1
Fair value
Debt securities	68,704	60,107
U.S. government and agency debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	50,592	38,406
Corporate debt securities \| Recurring Basis
Fair value
Debt securities	185,073	173,637
Corporate debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	185,073	173,145
Corporate debt securities \| Recurring Basis \| Level 3
Fair value
Debt securities		492
International government agency debt securities \| Recurring Basis
Fair value
Debt securities	91,941	77,504
International government agency debt securities \| Recurring Basis \| Level 2
Fair value
Debt securities	$ 91,941	$ 77,504

Fair Value Measurements - Additional Information (Details)	3 Months Ended
	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) item Milestone	Mar. 31, 2018 USD ($)	Mar. 31, 2020 item	Dec. 31, 2018 USD ($)
Fair Value
Transfers between the levels		$ 0
Contingent consideration		37,600,000			$ 65,200,000
Increase (decrease) in the fair value of contingent consideration		$ (22,600,000)	$ (1,900,000)
Discount Rate \| Real options approach
Fair Value
Discount rate (as a percent) \| item		15.0
Discount Rate \| Future royalties
Fair Value
Discount rate (as a percent) \| item		16.0
Recro
Fair Value
Milestone payments received		$ 5,000,000.0
Milestone payments receivable upon achievement of certain regulatory and sales milestones		130,000,000.0
Milestone payment upon regulatory approval of New Drug Application		5,000,000.0
Milestone annual payable		$ 45,000,000.0
Number of milestone payment upon approval of New Drug Application \| Milestone		7
Contingent consideration		$ 37,600,000			$ 65,200,000
Increase (decrease) in the fair value of contingent consideration		(22,600,000)	$ (1,900,000)
Recro \| Maximum
Fair Value
Milestone payments receivable		$ 80,000,000.0
Recro \| Forecast
Fair Value
Milestone payments receivable	$ 5,000,000.0
Recro \| Forecast \| Discount Rate
Fair Value
Discount rate (as a percent) \| item				16.0

Fair Value Measurements - Rollforward of the Fair Value of the Assets Determined using Level 3 Inputs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Roll forward of the fair value of the Company's investments whose fair value was determined using Level 3 inputs
Balance at the beginning of the period	$ 66,897
Payment received for contingent consideration	(5,000)
Impairment of corporate debt security	(492)
Balance at the end of the period	38,372
Change in the fair value of contingent consideration
Roll forward of the fair value of the Company's investments whose fair value was determined using Level 3 inputs
Change in the fair value	(22,600)
Decrease in the fair value of warrants
Roll forward of the fair value of the Company's investments whose fair value was determined using Level 3 inputs
Change in the fair value	$ (433)

Inventory - Schedule of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 33,526	$ 31,824
Work in process	41,548	38,019
Finished goods	17,787	20,353
Total inventory	$ 92,861	$ 90,196

Inventory - Schedule of Inventories (Parenthetical) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods inventory located at third-party warehouse and shipping service provider	$ 11.7	$ 11.0

Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, plant and equipment
Property, plant and equipment, gross	$ 607,081	$ 587,458
Less: accumulated depreciation	(287,077)	(277,471)
Total property, plant and equipment, net	320,004	309,987
Land
Property, plant and equipment
Property, plant and equipment, gross	6,560	6,486
Building and Improvements
Property, plant and equipment
Property, plant and equipment, gross	170,289	157,053
Furniture, Fixtures and Equipment
Property, plant and equipment
Property, plant and equipment, gross	320,882	314,831
Leasehold Improvements
Property, plant and equipment
Property, plant and equipment, gross	20,105	20,105
Construction in Progress
Property, plant and equipment
Property, plant and equipment, gross	$ 89,245	$ 88,983

Goodwill and Intangible Assets - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Goodwill
Gross Carrying Amount	$ 92,873
Net Carrying Amount	92,873	$ 92,873
Finite-lived intangible assets:
Gross Carrying Amount	582,750
Accumulated Amortization	(401,701)
Net Carrying Amount	$ 181,049	$ 191,001
Collaboration agreements
Finite-lived intangible assets:
Weighted Amortizable Life	12 years
Gross Carrying Amount	$ 465,590
Accumulated Amortization	(326,532)
Net Carrying Amount	$ 139,058
NanoCrystal technology
Finite-lived intangible assets:
Weighted Amortizable Life	13 years
Gross Carrying Amount	$ 74,600
Accumulated Amortization	(40,873)
Net Carrying Amount	$ 33,727
OCR technologies
Finite-lived intangible assets:
Weighted Amortizable Life	12 years
Gross Carrying Amount	$ 42,560
Accumulated Amortization	(34,296)
Net Carrying Amount	$ 8,264

Goodwill and Intangible Assets - Additional Information (Details) $ in Millions	Mar. 31, 2019 USD ($)
Expected amortization of intangible assets
2019	$ 40.0
2020	40.0
2021	40.0
2022	35.0
2023	$ 35.0

Leases - Additional Information (Details) $ in Thousands		1 Months Ended	3 Months Ended
Leases - Additional Information (Details) $ in Thousands	Jan. 01, 2019 USD ($) ft² Option	Mar. 31, 2018 ft²	Mar. 31, 2019 USD ($) lease	Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items]
Area of real estate property		220,000
Lessee operating lease term of option to extend		10 years
Number of additional operating leases \| lease			2
Weighted average incremental borrowing rate			4.46%
Weighted average remaining lease term			4 years 1 month 6 days
Right-of-use assets \| $	$ 20,100		$ 18,010
Operating lease liability \| $	$ 22,100		19,815	$ 53,601
Payments for operating leases \| $			2,300
Operating lease expense \| $			$ 2,100
MASSACHUSETTS \| Corporate office and administrative space expire in 2021
Lessee Lease Description [Line Items]
Area of real estate property	175,000
Maximum number of option to extend lease term \| Option	2
Lessee operating lease term of option to extend	5 years
Operating lease, existence of option to extend	true
MASSACHUSETTS \| Corporate office and administrative space expire in 2020
Lessee Lease Description [Line Items]
Area of real estate property	67,000
Maximum number of option to extend lease term \| Option	2
Lessee operating lease term of option to extend	1 year
Operating lease, existence of option to extend	true
Ireland \| Corporate office and administrative space expire in 2022
Lessee Lease Description [Line Items]
Area of real estate property	14,600
Lessee operating lease term of option to extend	5 years
Operating lease, existence of option to extend	true
Washington \| Corporate office and administrative space expire In 2029
Lessee Lease Description [Line Items]
Area of real estate property	7,000
Lessee operating lease term of option to extend	5 years
Operating lease, existence of option to extend	true

Leases - Summary of Future Lease Payments Under Non-Cancelable Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
2019	$ 6,806
2019			$ 9,394
2020	8,652		10,717
2021	2,520		4,706
2022	500		2,455
2023	509		2,389
Thereafter	3,100		23,940
Total lease payments	22,087		53,601
Less: imputed interest	(2,272)
Total operating lease liabilities	$ 19,815	$ 22,100	$ 53,601

Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accounts payable	$ 48,956	$ 39,767
Accrued compensation	48,653	67,613
Accrued sales discounts, allowances and reserves	140,736	152,911
Accrued other	75,624	73,471
Total accounts payable and accrued expenses	$ 313,969	$ 333,762

Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Long-term debt
Less: current portion	$ (2,843)	$ (2,843)
Long-term debt	275,923	276,465
2023 Term Loans
Long-term debt
2023 Term Loans, due March 26, 2023	278,766	279,308
Less: current portion	(2,843)	(2,843)
Long-term debt	$ 275,923	$ 276,465

Long-term Debt - Additional Information (Details) $ in Millions		3 Months Ended			12 Months Ended
	Oct. 12, 2016	Mar. 31, 2019 USD ($) Lender	Mar. 31, 2018 USD ($)	Mar. 26, 2018	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Long-term debt
Number of lender holding percentage of outstanding amount \| Lender		1
Percentage of outstanding principal amount held by lender		1.00%
Interest Expense
Long-term debt
Refinancing charges			$ 2.3
Minimum
Long-term debt
Threshold percentage comparing present value of remaining cash flows		10.00%
Term Loan B-1
Long-term debt
Due date of loan	Sep. 25, 2021
Variable interest rate base		LIBOR
Term Loan B-1 \| LIBOR
Long-term debt
Interest rate added to base rate (as a percent)				2.75%
Interest rate, variable interest rate floor (as a percent)				0.75%
2023 Term Loans
Long-term debt
Due date of loan					Mar. 26, 2023
Variable interest rate base		LIBOR
2023 Term Loans \| Level 2
Long-term debt
Amount to be realized in the future		$ 277.5			$ 277.5	$ 274.7
2023 Term Loans \| LIBOR
Long-term debt
Interest rate added to base rate (as a percent)					2.25%
Interest rate, variable interest rate floor (as a percent)					0.00%

Share-based Compensation - Schedule of Share-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based compensation Expense
Total share-based compensation expense	$ 24,616	$ 20,042
Cost of goods manufactured and sold
Share-based compensation Expense
Total share-based compensation expense	1,978	1,418
Research and development
Share-based compensation Expense
Total share-based compensation expense	7,746	6,714
Selling, General and Administrative
Share-based compensation Expense
Total share-based compensation expense	$ 14,892	$ 11,910

Share-based Compensation - Additional Information (Details) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) item	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Share-based compensation Expense
Share-based compensation expense		$ 24,616	$ 20,042
Cost of goods manufactured and sold
Share-based compensation Expense
Share-based compensation expense		1,978	1,418
Research and development
Share-based compensation Expense
Share-based compensation expense		7,746	6,714
Selling, General and Administrative
Share-based compensation Expense
Share-based compensation expense		$ 14,892	$ 11,910
Performance-based RSUs
Share-based compensation Expense
Number of Phase 3 studies of ALKS 3831 \| item		2
Number of years from the date of the grant		3 years
Unrecognized compensation cost		$ 33,200
Expiration period		3 years
Share-based compensation expense	$ 17,100
Performance-based RSUs \| Cost of goods manufactured and sold
Share-based compensation Expense
Share-based compensation expense	2,100
Performance-based RSUs \| Research and development
Share-based compensation Expense
Share-based compensation expense	6,700
Performance-based RSUs \| Selling, General and Administrative
Share-based compensation Expense
Share-based compensation expense	$ 8,300
Inventory
Share-based compensation Expense
Share based compensation cost capitalized		$ 2,900		$ 2,700

Loss Per Share - Schedule of Anti-Dilutive Potential Common Equivalent Shares Excluded from Calculation of Net (Loss) Income Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Denominator:
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share	14,754	13,025
Stock Options
Denominator:
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share	12,522	10,217
Restricted Stock Units
Denominator:
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share	2,232	2,808

Commitments and Contingent Liabilities - Additional Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Notice Filer
Commitments And Contingencies Disclosure [Abstract]
Potential losses from claims, legal proceedings probable of occurring \| $	$ 0
Number of separate Paragraph IV notices received \| Notice	11
Maximum number of days for lawsuit	45 days
Minimum number of months before FDA can approve patent request	30 months
Number of ANDA Filers consolidated to a single case \| Filer	8
Loss contingency lead plaintiff filing date	April 11, 2019
Loss contingency completion date	May 02, 2019