Entity Central Index Key Document and Entity Information Document And Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Investments—short-term Available For Sale Securities Debt Securities Current Receivables, net Receivables Net Current Contract assets Contract With Customer Asset Net Current Inventory Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current PROPERTY, PLANT AND EQUIPMENT, NET Property Plant And Equipment Net INTANGIBLE ASSETS, NET Finite Lived Intangible Assets Net INVESTMENTS—LONG-TERM Long Term Investments GOODWILL Goodwill CONTINGENT CONSIDERATION Business Combination Contingent Consideration Asset Noncurrent RIGHT-OF-USE ASSETS Operating Lease Right Of Use Asset DEFERRED TAX ASSETS Deferred Tax Assets Gross Noncurrent OTHER ASSETS Other Assets Noncurrent TOTAL ASSETS Assets LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities And Stockholders Equity [Abstract] CURRENT LIABILITIES: Liabilities Current [Abstract] Accounts payable and accrued expenses Accounts Payable And Accrued Liabilities Current Contract liabilities—short-term Contract With Customer Liability Current Operating lease liabilities—short-term Operating Lease Liability Current Long-term debt—short-term Long Term Debt Current Total current liabilities Liabilities Current LONG-TERM DEBT Long Term Debt Noncurrent OTHER LONG-TERM LIABILITIES Other Liabilities Noncurrent OPERATING LEASE LIABILITIES—LONG-TERM Operating Lease Liability Noncurrent CONTRACT LIABILITIES—LONG-TERM Contract With Customer Liability Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENT LIABILITIES (Note 14) Commitments And Contingencies SHAREHOLDERS’ EQUITY: Stockholders Equity [Abstract] 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 Preferred Stock Value 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 Common Stock Value Treasury shares, at cost (2,692,846 and 2,423,489 shares at March 31, 2019 and December 31, 2018, respectively) Treasury Stock Common Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total shareholders’ equity Stockholders Equity TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities And Stockholders Equity Preferred stock shares, par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred stock shares, authorized Preferred Stock Shares Authorized Preferred stock shares, issued Preferred Stock Shares Issued Preferred stock shares, outstanding Preferred Stock Shares Outstanding Ordinary shares, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Ordinary shares, shares authorized Common Stock Shares Authorized Ordinary shares, shares issued Common Stock Shares Issued Ordinary shares, shares outstanding Common Stock Shares Outstanding Treasury shares Treasury Stock Common Shares Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Article or substance produced by labor or machinery, and royalties. Manufacturing and royalty revenues Manufactured Product And Royalty [Member] Product sales, net Product [Member] Relating to research and development. Research and development revenue Research And Development [Member] Statement [Line Items] Statement [Line Items] REVENUES: Disaggregation Of Revenue [Abstract] Total revenues Revenue From Contract With Customer Excluding Assessed Tax EXPENSES: Costs And Expenses [Abstract] Cost of goods manufactured and sold (exclusive of amortization of acquired intangible assets shown below) Cost Of Goods And Services Sold Research and development Research And Development Expense Selling, general and administrative Selling General And Administrative Expense Amortization of acquired intangible assets Amortization Of Intangible Assets Total expenses Costs And Expenses OPERATING LOSS Operating Income Loss OTHER EXPENSE, NET: Nonoperating Income Expense [Abstract] Interest income Investment Income Interest Interest expense Interest Expense Change in the fair value of contingent consideration Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Asset1 Other (expense) income, net Other Nonoperating Income Expense Total other expense, net Nonoperating Income Expense LOSS BEFORE INCOME TAXES Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments INCOME TAX BENEFIT Income Tax Expense Benefit NET LOSS Net Income Loss LOSS PER ORDINARY SHARE: Earnings Per Share [Abstract] Basic and diluted (in dollars loss per ordinary share) Earnings Per Share Basic And Diluted WEIGHTED AVERAGE NUMBER OF ORDINARY SHARES OUTSTANDING: Weighted Average Number Of Shares Outstanding [Abstract] Basic and diluted (in shares) Weighted Average Number Of Share Outstanding Basic And Diluted COMPREHENSIVE LOSS: Comprehensive Income Net Of Tax [Abstract] Net loss Holding gain (loss), net of a tax provision (benefit) of $229 and $(100), respectively Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax COMPREHENSIVE LOSS Comprehensive Income Net Of Tax Tax (benefit) provision Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax Increase decrease in right of use asset. Increase decrease in operating lease liabilities. Proceeds from contingent consideration. Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Adjustments to reconcile net loss to cash flows from operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Share-based compensation expense Share Based Compensation Deferred income taxes Deferred Income Tax Expense Benefit Change in the fair value of contingent consideration Loss on debt refinancing Gains Losses On Extinguishment Of Debt Payment made for debt refinancing Payments Of Debt Restructuring Costs Other non-cash charges Other Noncash Expense Other non-cash charges Other Noncash Income Changes in assets and liabilities: Increase Decrease In Operating Capital [Abstract] Receivables Increase Decrease In Receivables Contract assets Increase Decrease In Contract With Customer Asset Inventory Increase Decrease In Inventories Prepaid expenses and other assets Increase Decrease In Prepaid Expenses Other Right-of-use assets Increase Decrease In Right Of Use Asset Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Contract liabilities Increase Decrease In Contract With Customer Liability Operating lease liabilities Increase Decrease In Operating Lease Liabilities Other long-term liabilities Increase Decrease In Other Operating Liabilities Cash flows provided by (used in) operating activities Net Cash Provided By Used In Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities [Abstract] Additions of property, plant and equipment Payments To Acquire Property Plant And Equipment Proceeds from the sale of equipment Proceeds From Sale Of Property Plant And Equipment Proceeds from contingent consideration Proceeds From Contingent Consideration Purchases of investments Payments To Acquire Marketable Securities Sales and maturities of investments Proceeds From Sale And Maturity Of Marketable Securities Cash flows (used in) provided by investing activities Net Cash Provided By Used In Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from the issuance of ordinary shares under share-based compensation arrangements Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Employee taxes paid related to net share settlement of equity awards Payments Related To Tax Withholding For Share Based Compensation Principal payments of long-term debt Repayments Of Long Term Debt Payment made for debt refinancing Payments Of Financing Costs Cash flows provided by (used in) financing activities Net Cash Provided By Used In Financing Activities NET DECREASE IN CASH AND CASH EQUIVALENTS Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CASH AND CASH EQUIVALENTS—Beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CASH AND CASH EQUIVALENTS—End of period SUPPLEMENTAL CASH FLOW DISCLOSURE: Supplemental Cash Flow Information [Abstract] Non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Purchased capital expenditures included in accounts payable and accrued expenses Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 This element represents receipt of Alkermes' stock for the exercise of stock options or to satisfy minimum tax withholding obligations related to stock based awards. This element represents receipt of Alkermes' stock for the exercise of stock options or to satisfy minimum tax withholding obligations related to stock based awards. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Ordinary Shares Common Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Treasury Stock Treasury Stock [Member] BALANCE BALANCE (in shares) Shares Issued Issuance of ordinary shares under employee stock plans Stock Issued During Period Value Share Based Compensation Issuance of ordinary shares under employee stock plans (in shares) Stock Issued During Period Shares Share Based Compensation Receipt of Alkermes' shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards Receipt Of Company Stock For Exercise Of Stock Options Or To Satisfy Minimum Tax Withholding Obligations Related To Stock Based Awards Value Receipt of Alkermes' shares for the excersise of stock options or to satisfy minimum tax withholding obligations related to share based awards (in shares) Receipt Of Company Stock For Exercise Of Stock Options Or To Satisfy Minimum Tax Withholding Obligations Related To Stock Based Awards Shares Share-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Unrealized gain (loss) on marketable securities, net of tax provision of $229 Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax Cumulative effect adjustment related to the adoption of new accounting standards New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification BALANCE BALANCE (in shares) Organization Consolidation And Presentation Of Financial Statements [Abstract] The Company Nature Of Operations Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Revenue From Contract With Customer [Abstract] Revenue from Contracts with Customers Revenue From Contract With Customer [Text Block] Investments Debt And Equity Securities [Abstract] Investments Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Inventory Disclosure [Abstract] Inventory Inventory Disclosure [Text Block] Property Plant And Equipment [Abstract] Property, Plant and Equipment Property Plant And Equipment Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Goodwill And Intangible Assets Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Payables And Accruals [Abstract] Accounts Payable and Accrued Expenses Accounts Payable And Accrued Liabilities Disclosure [Text Block] Debt Disclosure [Abstract] Long-term Debt Long Term Debt [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Share-based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Loss Per Share Earnings Per Share [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingent Liabilities Commitments And Contingencies Disclosure [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Use of Estimates Use Of Estimates Segment Information Segment Reporting Policy Policy [Text Block] Income Taxes Income Tax Policy [Text Block] New Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Schedule of manufacturing and royalty revenues. Schedule of Manufacturing and Royalty Revenues Schedule Of Manufacturing And Royalty Revenues Table [Text Block] Schedule of Disaggregation of Revenue Disaggregation Of Revenue Table [Text Block] Schedule of Contract Assets and Contract Liabilities Contract With Customer Asset And Liability Table [Text Block] Schedule of Investments Investment Table [Text Block] Tabular disclosure of the proceeds from sales and maturities of marketable securities, plus the resulting realized gains and losses. Schedule of Proceeds From Sales and Maturities of Marketable Securities Plus the Resulting Realized Gains and Losses Proceeds And Realized Gain Loss On Marketable Securities Table [Text Block] Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities Investments Classified By Contractual Maturity Date Table [Text Block] Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Rollforward of the Fair Value of the Assets Determined using Level 3 Inputs Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Schedule of Inventories Schedule Of Inventory Current Table [Text Block] Schedule of Property, Plant and Equipment Property Plant And Equipment [Text Block] Schedule of Goodwill and Intangible Assets Schedule Of Intangible Assets And Goodwill Table [Text Block] Summary of Future Lease Payments Under Non-Cancelable Leases Lessee Operating Lease Liability Maturity Table [Text Block] Schedule of Accounts Payable and Accrued Expenses Schedule Of Accounts Payable And Accrued Liabilities Table [Text Block] Schedule of Long-term Debt Schedule Of Debt Table [Text Block] Schedule of Share-based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Anti-Dilutive Potential Common Equivalent Shares Excluded from Calculation of Net (Loss) Income Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Number of business segments Number Of Reportable Segments Operating lease, right-of-use asset Operating lease liability Operating Lease Liability Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Type of Arrangement and Non-arrangement Transactions Type Of Arrangement [Axis] Arrangements and Non-arrangement Transactions Arrangements And Nonarrangement Transactions [Member] Manufacturing revenue. Manufacturing Revenue Manufacturing Revenue [Member] Royalty revenue. Royalty Revenue Royalty Revenue [Member] Represents information pertaining to INVEGA SUSTENNA/XEPLION AND INVEGA TRINZA products of the entity. INVEGA SUSTENNA/XEPLION and INVEGA TRINZA/TREVICTA Invega Sustenna Or Xeplion And Invega Trinza [Member] Represents information pertaining to AMPYRA/FAMPYRA, a product of the entity. AMPYRA/ FAMPYRA A M P Y R A Or F A M P Y R A [Member] Represents information pertaining to RISPERDAL CONSTA, a product of the entity. RISPERDAL CONSTA R I S P E R D A L C O N S T A [Member] Other products and services. Other Other Products And Services [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Total revenues Represents the information pertaining to VIVITROL. VIVITROL Vivitrol [Member] Represents the information pertaining to ARISTADA. ARISTADA Aristada [Member] Collaborative arrangement additional revenue. Customer Major Customers [Axis] Customer Name Of Major Customer [Domain] Biogen. Biogen Biogen [Member] Scenario Statement Scenario [Axis] Scenario, Unspecified Scenario Unspecified [Domain] Forecast Scenario Forecast [Member] Range Range [Axis] Range Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Total revenues related to license and collaboration agreement for Diroximel fumarate Additional revenue expected Collaborative Arrangement Additional Revenue Represents the manufacturing process period. Manufacturing Process period Manufacturing Process Period Amount of increase in contract assets due to additions during the period. Contract Asset [Abstract] Contract With Customer Asset Net [Abstract] Contract assets at beginning of period Additions Contract With Customer Asset Additions Transferred to receivables, net Contract With Customer Asset Reclassified To Receivable Contract assets at end of period Amount of increase in contract with customer liability during the period. Contract Liabilities [Abstract] Contract With Customer Liability [Abstract] Contract liabilities at beginning of the period Contract With Customer Liability Additions Contract With Customer Liability Additions Amounts recognized into revenue Contract With Customer Liability Revenue Recognized Contract liabilities at end of the period Represents the cost of debt and equity securities, which are categorized as held-to-maturity, trading securities and available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for less than twelve months for those securities that are categorized as held-to-maturity, trading securities and available-for-sale. Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for twelve months or longer for those securities that are categorized as held-to-maturity, trading securities and available-for-sale. Represents the cost of debt and equity securities, which are categorized as long-term held-to-maturity, trading securities and available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of long term debt and equity securities held at each balance sheet date, that was included in earnings for the period. Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for less than twelve months for those long term securities that are categorized as held-to-maturity, trading securities and available-for-sale. Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for more than twelve months for those long term securities that are categorized as held-to-maturity, trading securities and available-for-sale. Investment Holdings [Table] Investment Holdings [Table] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Short-term investments Short Term Investments [Member] Represents information pertaining to long-term investments. Long-term investments Long Term Investments [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Corporate debt securities Corporate Debt Securities [Member] U.S. government and agency debt securities U S Government Agencies Debt Securities [Member] International government agency debt securities Foreign Government Debt Securities [Member] Represents the information regarding fixed term deposit account member. Fixed Term Deposit Account Fixed Term Deposit Account [Member] Cash and Cash Equivalents Cash And Cash Equivalents [Axis] Cash and Cash Equivalents Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Certificates of deposit Certificates Of Deposit [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Available-for-sale securities: Available For Sale Securities [Abstract] Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Gross Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Gross Unrealized Losses, Less than One Year Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss Gross Unrealized Losses, Greater than One Year Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss Estimated Fair Value Available For Sale Securities Debt Securities Held-to-maturity securities: Held To Maturity Securities Parenthetical Disclosure [Abstract] Amortized Cost Held To Maturity Securities Amortized Cost Before Other Than Temporary Impairment Gross Unrealized Gains Held To Maturity Securities Accumulated Unrecognized Holding Gain Gross Unrealized Losses, Less than One Year Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss Gross Unrealized Losses, Greater than One Year Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss Estimated Fair Value Held To Maturity Securities Fair Value Long-term Investments Long Term Investments [Abstract] Amortized Cost Long Term Investment Amortized Cost Gross Unrealized Gains Long Term Investment Securities Unrealized Gain Loss Gross Unrealized Losses, Less than One Year Long Term Investment Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Gross Unrealized Losses, Greater than One Year Long Term Investment Securities Continuous Unrealized Loss Position More Than12 Months Aggregate Losses Total long-term investments Total investments Marketable Securities [Abstract] Amortized Cost Marketable Securities At Amortized Cost Gross Unrealized Gains Marketable Investments Securities Unrealized Gain Loss Gross Unrealized Losses, Less than One Year Marketable Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses Gross Unrealized Losses, Greater than One Year Marketable Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses Estimated Fair Value Investments Fair Value Disclosure Represents the profit realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale. Represents the loss realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale. Proceeds from the sales and maturities of marketable securities Realized gains Marketable Securities Realized Gain Realized losses Marketable Securities Realized Loss Available-for-sale, Amortized Cost Available For Sale Securities Debt Maturities Amortized Cost [Abstract] Within 1 year Available For Sale Securities Debt Maturities Within One Year Amortized Cost After 1 year through 5 years Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost Available-for-sale, Estimated Fair Value Available For Sale Securities Debt Maturities Fair Value [Abstract] Within 1 year Available For Sale Securities Debt Maturities Within One Year Fair Value After 1 year through 5 years Available For Sale Securities Debt Maturities After One Through Five Years Fair Value Total Held-to-maturity, Amortized Cost Held To Maturity Securities Debt Maturities Net Carrying Amount [Abstract] Within 1 year Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount After 1 year through 5 years Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount Total Held To Maturity Securities Held-to-maturity, Estimated Fair Value Held To Maturity Securities Debt Maturities Fair Value [Abstract] Within 1 year Held To Maturity Securities Debt Maturities Within One Year Fair Value After 1 year through 5 years Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value Total The amount represents the commitment on the equity method investment. Represents the entity's total commitment, inception to date, in its equity method investment. Represents the funding commitment expressed as a percentage of partnership's total funding. Schedule Of Equity Method Investments [Table] Schedule Of Equity Method Investments [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Assets Other Assets [Member] Investment, Name Schedule Of Equity Method Investment Equity Method Investee Name [Axis] Investment, Name Equity Method Investee Name [Domain] Represents information pertaining to Fountain Healthcare Partners II, L.P. of Ireland ("Fountain"), created to carry on the business of investing exclusively in companies and businesses engaged in healthcare, pharmaceutical and life sciences sectors. Fountain Healthcare Partners II, LP of Ireland Fountain Healthcare Partners Ii Lp Of Ireland [Member] Equity method investment Schedule Of Equity Method Investments [Line Items] Maximum commitment on equity method investment Commitment On Equity Method Investment Total equity method commitment Equity Method Commitment Funding commitment as percentage of partnership's total funding Funding Commitment As Percentage Of Partnerships Funding Increase (decrease) in carrying value of investment of the entity, which represents the Company's share of investee's net gains (losses) Income Loss From Equity Method Investments Carrying value of equity investment Equity Method Investments Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Asset Class Fair Value By Asset Class [Axis] Asset Class Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation By Asset Class [Domain] Measurement Frequency Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency Fair Value Measurement Frequency [Domain] Recurring Basis Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Level 3 Fair Value Inputs Level3 [Member] Fair value Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Cash equivalents Cash And Cash Equivalents Fair Value Disclosure Debt securities Contingent consideration Common stock warrants Warrants And Rights Outstanding Assets, Total Assets Fair Value Disclosure Represents the fair value of asset or liability transfers in a recurring basis between the levels. Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Legal Entity Legal Entity [Axis] Entity Entity [Domain] Recro Pharma Inc. Recro Recro Pharma Inc [Member] Measurement Input Type Measurement Input Type [Axis] Measurement Input Type Measurement Input Type [Domain] Discount Rate Measurement Input Discount Rate [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Future royalties. Future royalties Future Royalties [Member] Valuation Approach and Technique Valuation Technique [Axis] Valuation Approach and Technique Valuation Technique [Domain] Valuation technique real options. Real options approach Valuation Technique Real Options [Member] Fair Value Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] Transfers between the levels Fair Value Recurring Basis Assets Or Liabilities Transfers Between Levels Fair value measurement with unobservable inputs reconciliation recurring basis asset payment received for contingent consideration. Fair value measurement with unobservable inputs reconciliation recurring basis asset impairment of corporate debt security. Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table] Decrease in the fair value of warrants Warrant [Member] Represents the fair value of contingent consideration. Change in the fair value of contingent consideration Fair Value Of Contingent Consideration [Member] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Roll forward of the fair value of the Company's investments whose fair value was determined using Level 3 inputs Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward Balance at the beginning of the period Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Value Change in the fair value Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings1 Payment received for contingent consideration Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Payment Received For Contingent Consideration Impairment of corporate debt security Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Impairment Of Corporate Debt Security Balance at the end of the period Proceeds from milestone payment. Maximum milestone payments receivable upon achievement of certain regulatory and sales milestones. Represents the amount of milestone payments receivable. Milestone payments received Proceeds From Milestone Payment Milestone payments receivable Milestone Payments Receivable Milestone payments receivable upon achievement of certain regulatory and sales milestones Maximum Milestone Payments Receivable Upon Achievement Of Certain Regulatory And Sales Milestones Amount of milestone payment upon regulatory approval of NDA. Milestone payment payable. Number of equal annual milestone payment upon approval of non disclosure agreement. Milestone payment upon regulatory approval of New Drug Application Milestone Payment Upon Regulatory Approval Of Non Disclosure Agreement Milestone annual payable Milestone Payment Payable Number of milestone payment upon approval of New Drug Application Number Of Equal Annual Milestone Payment Upon Approval Of Non Disclosure Agreement Discount rate (as a percent) Long Term Debt Measurement Input Increase (decrease) in the fair value of contingent consideration Raw materials Inventory Raw Materials Net Of Reserves Work in process Inventory Work In Process Net Of Reserves Finished goods Inventory Finished Goods Net Of Reserves Total inventory Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale, located at third party warehouse and shipping service provider. Finished goods inventory located at third-party warehouse and shipping service provider Inventory Finished Goods Net Of Reserves Located At Third Party Warehouse And Shipping Service Provider Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Land Land [Member] Building and Improvements Building And Building Improvements [Member] Represents furniture, fixtures and equipment of the entity. Furniture, Fixtures and Equipment Furniture Fixture And Equipment [Member] Leasehold Improvements Leasehold Improvements [Member] Construction in Progress Construction In Progress [Member] Property, plant and equipment Property Plant And Equipment [Line Items] Property, plant and equipment, gross Property Plant And Equipment Gross Less: accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property, plant and equipment, net Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Collaboration agreements Licensing Agreements [Member] Information pertaining to NanoCrystal technology, an intangible asset acquired from third parties. NanoCrystal technology Nano Crystal Technology [Member] Information pertaining to OCR technology, an intangible asset acquired from third parties. OCR technologies O C R Technology [Member] Goodwill Finite Lived Intangible Assets [Line Items] Gross Carrying Amount Goodwill Gross Net Carrying Amount Finite-lived intangible assets: Finite Lived Intangible Assets Net [Abstract] Weighted Amortizable Life Finite Lived Intangible Asset Useful Life Gross Carrying Amount Finite Lived Intangible Assets Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Net Carrying Amount Expected amortization of intangible assets Finite Lived Intangible Assets Future Amortization Expense [Abstract] 2019 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2020 Finite Lived Intangible Assets Amortization Expense Year Two 2021 Finite Lived Intangible Assets Amortization Expense Year Three 2022 Finite Lived Intangible Assets Amortization Expense Year Four 2023 Finite Lived Intangible Assets Amortization Expense Year Five Represents the provision for extension of operating lease term. Lessee operating leases, maximum number of option to extend lease. Lessee Lease Description [Table] Lessee Lease Description [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] MASSACHUSETTS MASSACHUSETTS Name of Property Real Estate And Accumulated Depreciation Description Of Property [Axis] Name of Property Real Estate And Accumulated Depreciation Name Of Property [Domain] Represents information pertaining to corporate office and administrative space expires in 2021. Corporate office and administrative space expire in 2021 Corporate Office And Administrative Space Expire In2021 [Member] Represents information pertaining to corporate office and administrative space expires in 2020. Corporate office and administrative space expire in 2020 Corporate Office And Administrative Space Expire In2020 [Member] Ireland IRELAND Corporate office and administrative space expire in 2022 . Corporate office and administrative space expire in 2022 Corporate Office And Administrative Space Expire In2022 [Member] Washington WASHINGTON Corporate office and administrative space expire In 2029. Corporate office and administrative space expire In 2029 Corporate Office And Administrative Space Expire In Two Thousand Twenty Nine [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Area of real estate property Area Of Real Estate Property Maximum number of option to extend lease term Lessee Operating Leases Maximum Number Of Option To Extend Lease Lessee operating lease term of option to extend Operating Lease Provision For Extension Of Term Operating lease, existence of option to extend Lessee Operating Lease Existence Of Option To Extend Number of additional operating leases. Number of additional operating leases Number Of Additional Operating Leases Weighted average incremental borrowing rate. Weighted average incremental borrowing rate Weighted Average Incremental Borrowing Rate Weighted average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Right-of-use assets Payments for operating leases Operating Lease Payments Operating lease expense Operating Lease Expense 2019 Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2019 Lessee Operating Lease Liability Payments Due Next Twelve Months 2020 Lessee Operating Lease Liability Payments Due Year Two 2021 Lessee Operating Lease Liability Payments Due Year Three 2022 Lessee Operating Lease Liability Payments Due Year Four 2023 Lessee Operating Lease Liability Payments Due Year Five Thereafter Lessee Operating Lease Liability Payments Due After Year Five Total lease payments Lessee Operating Lease Liability Payments Due Less: imputed interest Lessee Operating Lease Liability Undiscounted Excess Amount Total operating lease liabilities Carrying value as of the balance sheet date of obligations relating to sales discounts, allowances and reserves. Accounts payable Accounts Payable Current Accrued compensation Due To Employees Current Accrued sales discounts, allowances and reserves Accrued Sales Discounts Allowances And Reserves Accrued other Other Accrued Liabilities Current Total accounts payable and accrued expenses Debt Instrument [Table] Debt Instrument [Table] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Represents the information pertaining to the 2023 Term Loans under the new term loan facility. 2023 Term Loans Twenty Twenty Three Term Loans [Member] Long-term debt Debt Instrument [Line Items] 2023 Term Loans, due March 26, 2023 Long Term Debt Less: current portion Long-term debt The floor for the variable rate base of the debt instrument. Represents the information pertaining to term loan B-1 under the new term loan facility. Term Loan B-1 Term Loan B1 [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] LIBOR London Interbank Offered Rate L I B O R [Member] Interest Expense Interest Expense [Member] Due date of loan Debt Instrument Maturity Date Variable interest rate base Debt Instrument Description Of Variable Rate Basis Interest rate added to base rate (as a percent) Debt Instrument Basis Spread On Variable Rate1 Interest rate, variable interest rate floor (as a percent) Debt Instrument Variable Rate Basis Floor Threshold percentage of present value of remaining cash flow difference used for determining if debt terms substantially different. Represents the number of lender holding percentage of outstanding amount. Percentage of outstanding principal amount held by lender. Threshold percentage comparing present value of remaining cash flows Threshold Percentage Comparison Present Value Remaining Cash Flows Number of lender holding percentage of outstanding amount Number Of Lender Holding Percentage Of Outstanding Amount Percentage of outstanding principal amount held by lender Percentage Of Outstanding Principal Amount Held By Lender Refinancing charges Restructuring Charges Amount to be realized in the future Debt Instrument Fair Value Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Cost of goods manufactured and sold Cost Of Sales [Member] Research and development Research And Development Expense [Member] Selling, General and Administrative Selling General And Administrative Expenses [Member] Share-based compensation Expense Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Total share-based compensation expense Allocated Share Based Compensation Expense Primary financial statement caption encompassing inventory assets. Inventory Inventory [Member] Award Type Award Type [Axis] Equity Award Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Represents performance based restricted stock units as awarded by a company to their employees as a form of incentive compensation. Performance-based RSUs Performance Based Restricted Stock Units [Member] Share based compensation cost capitalized Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount Represents the number of Phase 3 studies of ALKS 3831. Number of Phase 3 studies of ALKS 3831 Number Of Phase3 Studies Number of years from the date of the grant Share Based Compensation Arrangement By Share Based Payment Award Award Requisite Service Period1 Unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Expiration period Sharebased Compensation Arrangement By Sharebased Payment Award Expiration Period Share-based compensation expense Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Stock Options Employee Stock Option [Member] Restricted Stock Units Restricted Stock Units R S U [Member] Denominator: Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Potential losses from claims, legal proceedings probable of occurring Loss Contingency Accrual Provision Represents the number of separate Paragraph IV Certification Notices that have been received by the Company and/or its partner. Number of separate Paragraph IV notices received Number Of Separate Paragraph Four Notices Maximum period for lawsuit related to paragraph four certification notice Minimum period before FDA can approve patent request. Number of abbreviated new drug application filers consolidated to single case. Maximum number of days for lawsuit Maximum Period For Lawsuit Related To Paragraph Four Certification Notice Minimum number of months before FDA can approve patent request Minimum Period Before Fda Can Approve Patent Request Number of ANDA Filers consolidated to a single case Number Of Abbreviated New Drug Application Filers Consolidated To Single Case Loss contingency lead plaintiff filing date Loss Contingency Lawsuit Filing Date Loss contingency completion date Loss Contingency Date Of Dismissal