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Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Within 1 year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One LONG-TERM DEBT Long-Term Debt, Excluding Current Maturities Long-term debt, excluding current maturities Long-term debt Shares Acquired, Average Cost Per Share Shares repurchased price per share Acceleration of Avadel Shares [Member] Acceleration of Avadel Shares. Acceleration of Avadel Shares Plan Name [Axis] Equity [Abstract] Entity Current Reporting Status Entity Current Reporting Status Loss Contingency, Damages Sought, Value Additional sought value for damages as part of requested modification Goodwill, Gross Gross Carrying Amount Transfers between Level 2 to Level 1 Fair Value Recurring Basis Assets Or Liabilities Transfers Between Level Two To Level One Fair value recurring basis assets or liabilities transfers between level two to level one. U.S. government and agency debt securities US Government Agencies Debt Securities [Member] Baudax Baudax Bio Inc [Member] Baudax bio, inc. Contingent CVR Payment Contingent CVR payment. Contingent CVR payment to former employees Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value Level 2 Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Ordinary shares, shares authorized Common Stock, Shares Authorized Finite-Lived Intangible Asset, Expected Amortization, Year Four Expects to amortize of definite-lived intangible asset, 2030 OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Tax provision (benefit) Tax benefit Tax (benefit) provision Product and Service Product and Service [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Avadel Pharmaceuticals Plc [Member] Avadel pharmaceuticals plc. Avadel Pharmaceuticals Plc Other Long-Term Liabilities Components of other long-term liabilities Other long-term liabilities Rule 10b5-1 Arr Modified [Flag] Rule 10b5-1 Arrangement Modified [Flag] . Rule 10b5-1 Arrangement Modified Revenue from Contract with Customer [Abstract] Entity Shell Company Entity Shell Company Accrued other Other Accrued Liabilities, Current SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Short-term investments Short-Term Investments [Member] Segment Information Segment Reporting, Policy [Policy Text Block] Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalent Cash and cash equivalents Business Combination, Pro Forma Information, Loss on Extinguishment Business combination, pro forma information, loss on extinguishment. Loss on extinguishment Discontinued Operations Discontinued Operations [Member] Schedule of Maturities of Long-Term Debt [Table Text Block] Scheduled of maturities long term debt Ordinary shares, shares issued Common Stock, Shares, Issued Asset Class Asset Class [Domain] Statement [Table] Statement [Table] Receivables Increase (Decrease) in Receivables, Total Increase (Decrease) in Receivables After 1 year through 5 years Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five Statement [Line Items] Statement [Line Items] Treasury Stock, Value, Acquired, Cost Method Repurchase of Alkermes' ordinary shares Business Combination [Domain] Revenue from Contracts with Customers Revenue from Contract with Customer [Policy Text Block] Other Expense, Net Other Expense [Member] Entity Filer Category Entity Filer Category Reclassification Reclassification, Comparability Adjustment [Policy Text Block] TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity Debt Instrument [Line Items] Payables and Accruals [Abstract] Current portion of long-term debt Long-Term Debt, Current Maturities Long-Term Debt, Current Maturities, Total Less: current portion Less: current portion Two Thousand And Eighteen Stock Option And Incentive Plan [Member] Two thousand and eighteen stock option and incentive plan. 2018 Stock Option and Incentive Plan Purchases of investments Payments to Acquire Marketable Securities Long-Term Debt, Maturity, Year Three 2029 Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Summary of Investment Holdings [Line Items] Proceeds from Issuance of Debt Proceeds from the issuance of debt, net Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Shares Issued, Price Per Share Issued ordinary share Subsequent Event [Line Items] Share Repurchase Program [Table] GOODWILL Goodwill, Total Goodwill Net Carrying Amount Goodwill at December 31, 2025 Goodwill at March 31, 2026 Effective Income Tax Rate Reconciliation, Percent, Total Effective Income Tax Rate Reconciliation, Percent Effective tax rate Stock Options Eight Five Two Winter Street Lease. Eight Five Two Winter Street Lease [Member] Eight Five Two Winter Street Lease 852 Winter Street Lease Interest income Investment Income, Interest Treasury Stock, Common, Value Treasury shares, at cost (17,130,569 and 15,404,138 shares at March 31, 2026 and December 31, 2025, respectively) Long-term investments, Estimated Fair Value Debt Securities, Available-for-Sale, Noncurrent Geographical [Domain] Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Numerator: Procceds from sale of development and manufacturing facility Proceeds from Sale, Property, Held-for-Sale Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Debt Issuance Costs, Net Debt Issuance Costs, Net, Total Unamortized deferred financing costs Bridge Term Loan Credit Agreement Bridge Term Loan Credit Agreement [Member] Bridge term loan credit agreement. Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] External Research and Development Expenses [Abstract] External research and development expenses [Abstract] External R&D expenses: Property, Plant and Equipment [Line Items] Property, plant and equipment Long-term investments Represents information pertaining to long-term investments. Long Term Investments [Member] Long-term investments Finite-Lived Intangible Asset, Useful Life Weighted Amortizable Life Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] State u.s. medicaid rebates. State U.S. Medicaid Rebates [Member] State U.S. Medicaid Rebates Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Basic (Loss) Earnings Per Ordinary Share Cash Consideration Paid For Ordinary Shares Cash consideration paid for ordinary shares. Cash consideration paid for Avadel's ordinary shares Business Combination, Pro Forma Information, Direct One-Time Transaction Costs Business combination, pro forma information, direct one-time transaction costs. Direct one-time transaction costs Christopher Wright [Member] Christopher wright member. Investment, Name Investment, Name [Axis] Schedule of Contractual Maturities of Available-for-Sale and Held-to-Maturity Securities Investments Classified by Contractual Maturity Date [Table Text Block] Earnings Per Share, Basic Earnings (loss) per share - basic (Loss) earnings per ordinary share- basic (Loss) earnings per ordinary share- basic Schedule of Disaggregation of Revenues Disaggregation of Revenue [Table Text Block] Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Liability Addition of Contingent Consideration Post Combination Expense Fair value measurement with unobservable inputs reconciliation recurring basis liability addition of contingent consideration post combination expense. Addition of contingent consideration related to CVR Milestone for post-combination expense Held-to-maturity securities, Gross Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Long-Acting INVEGA Products Long Acting I N V E G A Products [Member] Long-Acting INVEGA Products. Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Foreign currency translation loss Indefinite-Lived Intangible Assets Acquired In-process research and development Finite-Lived Intangible Assets Acquired LUMRYZ Debt Securities, Unrealized Gain (Loss) Debt Securities, Unrealized Gain (Loss), Total Unrelaised amount Total current liabilities Liabilities, Current Adjustments to reconcile net income to cash flows from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Facility and Certain Related Assets [Member] Facility and certain related assets. Transferred to receivables, net Contract with Customer, Asset, Reclassified to Receivable Inventory Step-Up Amortization Period Inventory step-up amortization period. Inventory step-up amortization period Mural Oncology plc Mural Oncology plc [Member] Finished goods Inventory, Finished Goods, Net of Reserves Available-for-sale, Estimated Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Transfers between Level 1 to Level 2 Fair Value Recurring Basis Assets Or Liabilities Transfers Between Level One To Level Two Fair value recurring basis assets or liabilities transfers between level one to level two. Other long-term liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Payments of Debt Issuance Costs Deferred financing costs paid to third-parties Deferred financing costs paid to third-parties SHAREHOLDERS’ EQUITY: Equity, Attributable to Parent [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of Fair value of Assets Determined Using Level 3 Inputs Entity Small Business Entity Small Business Retained Earnings (Accumulated Deficit), Total Accumulated deficit Retained Earnings (Accumulated Deficit) The Company Nature of Operations [Text Block] Schedule of Investments Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] Share-based Compensation Share-Based Payment Arrangement [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Leases [Abstract] Increase decrease in accrued sales discount, allowances and reserves. Increase Decrease In Accrued Sales Discount Allowances And Reserves Accrued sales discounts, allowances and reserves Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total Weighted Average Number of Shares Outstanding, Diluted, Adjustment Dilutive ordinary share equivalents Contract with Customer, Liability, Total Contract liabilities Contract liabilities at beginning of the period Contract liabilities at end of the period Contract with Customer, Liability Lessee, Lease, Description [Line Items] Lessee Lease Description [Line Items] Amendment Flag Amendment Flag Product and Service Product and Service [Domain] Long-Lived Asset, Held-for-Sale, Type [Axis] Inventory Inventory Disclosure [Text Block] Sales and maturities of investments Proceeds from Sale, Maturity and Collection of Investments Proceeds from Sale, Maturity and Collection of Investments, Total Synchronicity Pharma Inc Synchronicity Pharma Inc [Member] Synchronicity Pharma Inc. Disposal Group, Including Discontinued Operation, Assets, Current Total currents assets Assets related to discontinued operations LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Cash flows (used in) provided by operating activities Ordinary Shares Common Stock [Member] Business Combination, Recognized Asset Acquired, Inventory, Current Inventory Long-Term Debt, Maturity, Year One 2027 Lessee, Operating Lease, Liability, to be Paid, Year Three 2029 Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Debt Securities, Held-to-Maturity, Fair Value, Noncurrent Held-to-maturity securities, Estimated Fair Value Beginning balance Provisions For Sales And Allowances provisions for sales and allowances. Ending Balance Revenue-related reserves Development programs: Development Programs [Abstract] Development programs. Business Combination, Contingent Consideration, Liability, Measurement Input Discount rate Entity Address, Address Line One Entity Address, Address Line One Accounts Payable And Accrued Expenses [Table] Accounts Payable And Accrued Expenses [Table] Accounts payable and accrued expenses. Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Other non-cash charges Other Noncash Expense Earnings Per Share [Abstract] (LOSS) EARNINGS PER ORDINARY SHARE: Amortization Of Inventory Step-up Amortization of inventory step-up. Amortization of inventory step-up SUPPLEMENTAL CASH FLOW DISCLOSURE: Supplemental Cash Flow Information [Abstract] Schedule of Revenue Related Reserves Included in Consolidated Balance Sheets Revenue Related Reserves Included In Consolidated Balance Sheets [Table Text Block] Revenue related reserves included in consolidated balance sheets. Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Discounts [Member] Discounts. Discounts Balance Sheet Location Statement of Financial Position Location, Balance [Axis] Investment Type [Axis] Occupancy internal research and development expenses Occupancy internal research and development expenses. Occupancy RIGHT-OF-USE ASSETS Operating Lease, Right-of-Use Asset Right-of-use asset Number of investment securities. Number Of Investment Securities Number of investment securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Total Aggregate estimated fair value of investments in unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position Inventory Disclosure [Abstract] Document Type Document Type JPMorgan Chase Bank, N.A. JPMorgan Chase Bank, N.A [Member] JPMorgan Chase Bank, N.A. Income Taxes Paid, Net Income Taxes Paid, Net, Total Cash paid for taxes Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Entity Central Index Key Entity Central Index Key Entity Central Index Key Investments, Debt and Equity Securities [Abstract] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Subsequent Event Type [Domain] Manufacturing and royalty revenues Manufactured Product And Royalty [Member] Article or substance produced by labor or machinery, and royalties. Operating Activities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive potential common share equivalent excluded from calculation of net earnings per ordinary share Business Combination Recognized Asset Acquired Right Of Use Assets Business combination recognized asset acquired right of use assets. Right-of-use assets Ordinary shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Nominal value Deferred tax assets Business Combination, Recognized Asset Acquired, Deferred Tax Asset Letter Agreement Letter Agreement [Member] Letter Agreement. Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed, Total Purchased capital expenditures included in accounts payable and accrued expenses Increase (Decrease) in Other Operating Liabilities, Total Other long-term liabilities Increase (Decrease) in Other Operating Liabilities Debt Securities, Available-for-Sale, Amortized Cost Total Debt securities Total Estimated Fair Value Debt Securities, Available-for-Sale Right-of-use assets, discontinued operating activities Right-of-use assets, discontinued operating activities Right-of-use assets Additions Contract with Customer, Asset, Purchase Business Acquisition Potential Additional Cash Payment Per Share Upon Achievement Of Specific Milestone Business acquisition potential additional cash payment per share upon achievement of specific milestone. Potential additional cash payment per share upon achievement of specific milestone Potential additional cash payment per share upon achievement of certain specific milestone Debt Disclosure [Abstract] Year Ending December 31: VIVITROL Vivitrol [Member] Represents the information pertaining to VIVITROL. Recognized share-based compensation expense Business Combination, Recognized Share-Based Compensation Expense Business combination, recognized share-based compensation expense. Pillar two. Pillar Two [Member] Pillar Two Accrued Sales Discount Allowances And Reserves [Line Items] Accrued Sales Discount Allowances And Reserves [Line Items] Accrued sales discount allowances and reserves line items. Cost of goods manufactured and sold Cost of Sales [Member] Cost of goods manufactured Share-based compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Long-Term Debt Instruments [Table] Document Quarterly Report Document Quarterly Report Internal R&D expenses: Internal Research and Development Expenses [Abstract] Internal research and development expenses. Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Realized gains Marketable Securities Realized Gain Represents the profit realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale. Discontinued operation agreement date. Discontinued Operation Agreement Date Discontinued operation agreement date Investment, Name Investment, Name [Domain] Schedule of the Total of Purchase Consideration Business Combination [Table Text Block] Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred stock shares, outstanding Preferred Stock, Shares Outstanding Comprehensive Income (Loss), Net of Tax, Attributable to Parent COMPREHENSIVE (LOSS) INCOME Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gains Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Discontinued Operations Geographical [Axis] Line of Credit Facility, Lender [Domain] Amounts recognized into revenue Contract with Customer, Liability, Revenue Recognized Transaction costs Business Combination, Transaction Cost, Excluding Separately Recognized Transaction Proceeds from Operating Activities [Abstract] OPERATING ACTIVITIES: Discontinued Operations, Policy [Policy Text Block] Discontinued Operations Reduction of Accounts Receivable Accounts Receivable [Member] Contract Liabilities [Abstract] Contract with Customer, Liability [Abstract] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Schedule of Share-based Compensation Expense Depreciation and Amortization, Discontinued Operations Depreciation Summary of the Significant Non-cash Items and Capital Expenditures of the Discontinued Operations Summary of the Significant Non-cash Items and Capital Expenditures of the Discontinued Operations Summary of Significant Non-cash Items and Capital Expenditures of Discontinued Operations DEFERRED TAX ASSETS Deferred Income Tax Assets, Net Deferred tax assets Proceeds from the sales and maturities of investments Sales and maturities of investments Proceeds from Sale and Maturity of Marketable Securities Subsequent Event [Member] Subsequent Event Organization, Consolidation and Presentation of Financial Statements [Table] Organization, consolidation and presentation of financial statements. Long-Term Debt, Maturity, Remainder of Fiscal Year 2026 Property, Plant and Equipment [Abstract] Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Noncurrent Held-to-maturity securities, Amortized Cost OTHER ASSETS Other Assets, Noncurrent Investments—short-term Debt Securities, Available-for-Sale, Current Short-term investments, Estimated Fair Value VUMERITY Vumerity [Member] Represents the information pertaining to VUMERITY. Antidilutive Securities Antidilutive Securities [Axis] Prepaid expenses and other current assets Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current Long-term investments, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Noncurrent Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Interest Expense, Debt Interest Expense, Debt, Total Financing costs Schedule of the transfer of assets and liabilities was effected in accordance with the separation agreements. Schedule of the Transfer of Assets and Liabilities was Effected in Accordance with the Separation Agreements [Table Text block] Schedule of Transfer of Assets and Liabilities Effected in Accordance with Separation Agreements Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount, Total Unamortized original issue discount costs Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Convertible Promissory Notes Convertible Promissory Notes [Member] Convertible promissory notes. Finite-Lived Intangible Assets, Major Class Name [Domain] Treasury Stock, Common, Shares Treasury shares Treasury Stock, Common, Shares Treasury Stock, Common, Shares Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Business Combination, Consideration Transferred Total preliminary purchase consideration Cash placed in escrow account Escrow Deposit Disbursements Related to Property Acquisition Lessee, Operating Lease, Option to Extend Option to extend, description Preferred Stock, Value, Issued Preferred shares, par value, $0.01 per share: 50,000,000 shares authorized; and zero issued and outstanding at March 31, 2026 and December 31, 2025, respectively. Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Intangible assets Total identifiable intangible assets Disposal Groups, Including Discontinued Operations [Table Text Block] Summary of Discontinued Operations Selling, general and administrative Selling, General and Administrative Expense Total selling, general and administrative expense Minimum [Member] Minimum Business Combination, Pro Forma Information, Nonrecurring Adjustment, Inventory, Fair Value Adjustment [Member] Step-up Adjustment Financial Instrument Financial Instrument [Axis] Effective statutory tax rate continuing operations. Effective Statutory Tax Rate Continuing Operations Statutory tax rate CURRENT ASSETS: Assets, Current [Abstract] Product Discounts Product Discounts [Member] Product discounts. Fair Value Of Contingent Consideration Fair value of contingent consideration. Fair value of CVR contingent consideration Amortization of acquired intangible assets Amortization of Intangible Assets Level 3 Fair Value, Inputs, Level 3 [Member] Share Repurchase Program [Line Items] Segment Reporting [Abstract] Business Combination, Recognized Asset Acquired, Asset Total fair value of assets acquired Business Combination [Policy Text Block] Business Combinations Summary of the Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] CURRENT LIABILITIES: Liabilities, Current [Abstract] Product sales, net Product [Member] Richard Pops [Member] Richard Pops [Member]. Business Combination, Recognized Liability Assumed Operating lease liabilities Operating lease liabilities Business Combination, Recognized Liability Assumed Operating lease liabilities. External Research and Development expenses External research and development expenses. Total external R&D expenses BALANCE (in shares) BALANCE (in shares) Shares, Outstanding Disposal Group, Including Discontinued Operation, Deferred Tax Assets Deferred tax asset Commitments and Contingencies COMMITMENTS AND CONTINGENT LIABILITIES (Note 18) Contract with Customer, Asset, Allowance for Credit Loss [Table Text Block] Schedule of Provisions for Sales and Allowances SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Issuance of ordinary shares under employee stock plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Total operating lease liabilities Operating Lease, Liability Work in process Inventory, Work in Process, Net of Reserves Debt Instrument, Basis Spread on Variable Rate Interest rate added to base rate (as a percent) Schedule of Goodwill [Table Text Block] Summary of Goodwill Prepaid expenses and other assets Increase (Decrease) in Prepaid Expenses, Other Restricted Cash, Current Restricted cash Long-Term Debt, Maturity, Year Two 2028 Current provisions relating to sales in current year Current Provisions Relating To Sales In Current Year Current provisions relating to sales in current year. Organization, Consolidation and Presentation of Financial Statements [Line Items] Organization, consolidation and presentation of financial statements. Lessee, Lease, Description [Table] Acceleration of unvested share-based compensation awards Business Combination, Pro Forma Information, Acceleration of Unvested Share-Based Compensation Awards Business combination, pro forma information, acceleration of unvested share-based compensation awards. Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (loss) income Disposal Group, Including Discontinued Operation, Liabilities, Current Total current liabilities Liabilities related to discontinued operations Cash and cash equivalents BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Disposal Group, Including Discontinued Operation, Operating Expense Total operating expenses from discontinued operations Amortized Cost Total Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Long-Term Debt, Type [Domain] Weighted Average Number of Shares Outstanding, Basic, Total Basic Weighted Average Number of Shares Outstanding, Basic Goodwill, Acquired During Period Additions in connection with the Avadel Acquisition Unpaid Contingent Consideration Unpaid contingent consideration. Unpaid contingent consideration Segment Reporting, Expense Information Used by CODM, Description Available-for-sale, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Incremental share-based compensation expense related to certain equity awards Share-Based Payment Arrangement, Plan Modification, Incremental Cost Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Net income from continuing operations NET INCOME FROM CONTINUING OPERATIONS Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Gross Unrealized Losses greater than one year Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Disposal group including discontinued operation operating lease liabilities non-current. Disposal Group Including Discontinued Operation Operating Lease Liabilities Non-current Operating lease liabilities-long-term Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Potential material losses from claims, legal proceedings probable of occurring Loss Contingency Accrual, Provision Subsequent Events [Text Block] Subsequent Event Inventory, Raw Materials, Net of Reserves Raw materials Long-Term Debt Total Long-term debt current and non-current APIC, Share-Based Payment Arrangement, Increase for Cost Recognition, Total Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Manufacturing Revenue Manufacturing Revenue [Member] Manufacturing revenue. Variable Rate [Domain] Total shareholders’ equity BALANCE BALANCE Equity, Attributable to Parent Preferred stock shares, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share LUMRYZExternalResearchAndDevelopmentExpensesDevelopmentPrograms Lumryz external research and development expenses development programs. LUMRYZ Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Lessee, Operating Lease, Existence of Option to Extend [true false] Option to extend Statement of Stockholders' Equity [Abstract] Expects to amortize of definite-lived intangible asset, 2026 Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Use of Estimates Use of Estimates, Policy [Policy Text Block] Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Total Property, plant and equipment Treasury Stock, Common [Member] Treasury Stock Leasehold Improvements Leasehold Improvements [Member] Entity Address, Address Line Two Entity Address, Address Line Two Fair Value Fair Value Disclosures [Text Block] Inventory Inventories [Member] Debt Instrument, Name Debt Instrument, Name [Domain] Noncash Investing and Financing Items [Abstract] INVESTING ACTIVITIES: Measurement Input, Discount Rate [Member] Discount Rate Long-Term Debt, Maturity, Year Four 2030 Inventory, Current [Table] Income taxes. Income Taxes [Table] Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] Current Liabilities: In Process Research and Development [Member] IPR&D Research and development revenue Segment Reporting, Other Segment Item, Amount Other segment (expense) income Plan Name [Domain] Contingent consideration Business Combination, Recognized Liability Assumed, Contingent Liability Fair value Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Entity [Domain] Credit Facility [Axis] Cost of Goods and Services Sold, Total Cost of goods manufactured and sold (exclusive of amortization of acquired intangible assets shown below) Cost of Product and Service Sold Business Combination, Intangible Asset, Acquired, Finite-Lived and Indefinite-Lived [Table Text Block] Schedule of Identifiable Intangible Assets Acquired Certificates of deposit Certificates of Deposit [Member] Business Combination, Recognized Liability Assumed, Liability [Abstract] Assumed Liabilities: Related Party Related and Nonrelated Parties [Axis] Other Adjustments [Member] Other adjustments. Other Disposal group including discontinued operation right of use assets. Disposal Group Including Discontinued Operation Right Of Use Assets Right-of-use assets Disposal Group Name [Domain] LUMRYZ L U M R Y Z [Member] LUMRYZ. Entity Address, City or Town Entity Address, City or Town Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Income Taxes [Line Items] Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability, Total Contingent consideration liability Number of business segments Number of Reportable Segments 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 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. Security Exchange Name Security Exchange Name Credit Facility [Domain] Gross Carrying Amount Net Carrying Amount Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill), Total Gross Carrying Amount Adjustments Relating To Prior Years Adjustments relating to prior years. Adjustments relating to prior years Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property, plant and equipment, gross Property, Plant and Equipment, Gross Counterparty Name Counterparty Name [Axis] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (LOSS) INCOME BEFORE INCOME TAXES Net loss from discontinued operations Net loss and comprehensive loss from discontinued operations DISCONTINUED OPERATIONS, NET OF TAX LOSS ON DISCONTINUED OPERATIONS, NET OF TAX Measurement Input Type [Domain] Assets Held for Sale Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Stockholders' Equity Note [Abstract] Total inventory Inventory Inventory, Net Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total cash, cash equivalents and restricted cash CASH, CASH EQUIVALENTS AND RESTRICTED CASH-Beginning of period CASH, CASH EQUIVALENTS AND RESTRICTED CASH-End of period Contractual Adjustments [Member] Contractual Adjustments. Contractual Adjustments Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Statistical Measurement Statistical Measurement [Domain] Total current assets Assets, Current Total share-based compensation expense Share-Based Payment Arrangement, Expense Total share-based compensation expense Share-based compensation expense Investment Holdings [Table] Discontinued Operation, Period of Continuing Involvement after Disposal Service agreement term Document Period End Date Document Period End Date Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Direct one-time acquisition transaction costs Business Combination, Pro Forma Information, Direct One Time Acquisition Transaction Costs Business combination, pro forma information, direct one time acquisition transaction costs. Fountain Healthcare Partners II Fountain Healthcare Partners Ii Lp Of Ireland [Member] 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. Long-term Debt Long-Term Debt [Text Block] Avadel Acquisition [Member] Avadel acquisition member. Avadel Acquisition Statement of Financial Position [Abstract] Restricted Stock Unit Awards Restricted Stock Units (RSUs) [Member] Current Assets: Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] Acquired Assets: Business Combination, Recognized Asset Acquired, Asset [Abstract] Gain on sale of assets Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Number of investment securities in an unrealized loss position Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Assignment. Assignment [Member] Assignment Provisions For Sales Discounts And Allowances Acquisition Provisions for sales discounts and allowances acquisition. Avadel beginning balance as of February 12, 2026 IRELAND Ireland Other internal research and development expenses Other internal research and development expenses. Other internal R&D expenses Impact of new tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Total liabilities Liabilities 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. 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' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards Financial Instruments Financial Instruments [Domain] Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Cash and cash equivalents Within 1 year Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Contract liabilities–short-term Contract Liabilities [Member] Contract liabilities. Within 1 year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Lessee, Operating Lease, Liability, to be Paid, Year Two 2028 Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Variable Rate [Axis] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross, Total Gross Carrying Amount Gross Unrealized Losses less than one year Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Diluted Weighted Average Number of Shares Outstanding, Diluted Shares used in calculating diluted earnings (loss) per share Shares used in calculating diluted (loss) earnings per ordinary share Entity File Number Securities Act File Number OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Holding (loss) gain, net of a tax (benefit) provision of $(171), and $168, respectively Unrealized gain (loss) on marketable securities, net of tax benefit (provision) Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate. Cover [Abstract] Unpaid deferred financing costs to third-parties Unpaid Deferred Financing Costs To Third Parties Unpaid deferred financing costs to third parties. Measurement Input Type [Axis] ARISTADA and ARISTADA INITIO Aristada And Aristada Initio [Member] Aristada and Aristada Initio. Increase (Decrease) in Accounts Payable and Accrued Liabilities, Total Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Internal research and development expenses Internal research and development expenses. Total internal R&D expenses Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Investments [Domain] Payments Credits Relating To Sales In Prior Years Payments credits relating to sales in prior years. Payments relating to sales in prior years Manufacturing Process period Manufacturing Process Period Represents the manufacturing process period. Amortized Cost Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Segment Reporting Disclosure [Text Block] Segment Reporting General and administrative expense General and Administrative Expense General and Administrative Expense, Total Selling, general and administrative expenses: Selling, General and Administrative Expense [Abstract] Business Combination, Contingent Consideration, Liability, Noncurrent CONTINGENT CONSIDERATION Medicaid Rebate Medicaid Rebate [Member] Medicaid rebate. Business Combination Contingent Consideration Additional Cash Payment Per Share Business combination, contingent consideration, additional cash payment per share. Business combination, contingent consideration, additional cash payment per share Subsequent Event [Table] Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Business Combination, NET INCOME (LOSS) Net loss Right-of-use assets Increase Decrease In Right Of Use Asset Increase decrease in right of use asset. Business Combination, Recognized Liability Assumed, Accounts Payable, Current Accounts payable and accrued expenses Business Combination, Pro Forma Information [Line Items] Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net, Ending Balance Finite-Lived Intangible Assets, Net, Beginning Balance Net Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Gross Carrying Amount, Total Operating lease expense Operating Lease, Expense Operating lease expense from continuing operations 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. Receipt Of Company Stock For Exercise Of Stock Options Or To Satisfy Minimum Tax Withholding Obligations Related To Stock Based Awards Shares Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares) New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Summary of Future Lease Payments Under Non-Cancelable Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Denominator: Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Contract liabilities—short-term Contract with Customer, Liability, Current Held-to-maturity, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Assets held for sale member. Assets Held For Sale [Member] Assets Held For Sale Contract assets Increase (Decrease) in Contract with Customer, Asset Business Combination, Pro Forma Information, Nonrecurring Adjustment [Axis] Investee Investee [Member] Long-Lived Assets Held-for-Sale, Name [Domain] Payments Credits Relating To Sales In Current Year Payments credits relating to sales in current year. Payments relating to sales in current year Lease term of contract Lessee, Operating Lease, Term of Contract Long-Term Investments, Total Total long-term investments INVESTMENTS—LONG-TERM Long-Term Investments Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Ordinary shares, shares outstanding Common Stock, Shares, Outstanding Operating lease liabilities—short-term Operating Lease, Liability, Current Depreciation, Depletion and Amortization, Total Depreciation and amortization Depreciation, Depletion and Amortization Document Transition Report Document Transition Report Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Property, plant and equipment, net Research and development Research and Development Expense R&D expenses Total Estimated Fair Value Debt Securities, Held-to-Maturity, Fair Value Leases Lessee, Operating Leases [Text Block] Payments for Repurchase of Common Stock Payment for the repurchase of ordinary shares Short-term investments, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Current Statement of Cash Flows [Abstract] Meloxicam Product Meloxicam Product [Member] Meloxicam Product [Member] Contingent consideration Contingent Consideration Fair Value Disclosure Contingent consideration fair value disclosure. Operating Activities [Domain] Contingent payments Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amounts Employee service share based compensation allocation of recognized period costs capitalized amounts. Share based compensation cost capitalized Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Business combination, net of cash acquired Business combination, net of cash acquired Equity [Text Block] Shareholders' Equity Operating lease liabilities, discontinued operating activities Operating lease liabilities, discontinued operating activities Operating lease liabilities Business Combination, Recognized Liability Assumed, Accrued sales discounts, allowances and reserves Business Combination, Recognized Liability Assumed, Accrued sales discounts, allowances and reserves. Accrued sales discounts, allowances and reserves Finite-Lived Intangible Assets [Line Items] Earnings Per Share [Text Block] (Loss) Earnings Per Ordinary Share Non-U.S. government debt securities Debt Security, Government, Non-US [Member] Discontinued Operations and Disposal Groups [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Investments determined using Level 3 inputs Balance, January 1, 2026 Balance, March 31, 2026 Contract Asset [Abstract] Contract with Customer, Asset, after Allowance for Credit Loss [Abstract] NET (LOSS) INCOME Net (loss) income Increase (Decrease) in Inventories, Total Inventory Increase (Decrease) in Inventories Inventory [Line Items] Estimated Fair Value Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value Operating lease liabilities Increase Decrease In Operating Lease Liabilities Increase decrease in operating lease liabilities. Risks and Uncertainties Risk And Uncertainties Policy [Text Block] Risk and uncertainties. INTANGIBLE ASSETS, NET Intangible Assets, Net (Excluding Goodwill) Net Carrying Amount, Total Nancy Lurker [Member] Nancy Lurker Operating Lease, Payments Payments for operating leases ASSETS Assets [Abstract] Income Tax Authority, Name [Axis] LYBALVI L Y B A L V I [Member] LYBALVI. Purchase price Business Combination, Price of Acquisition, Expected Construction in Progress Construction in Progress [Member] Amortization of Debt Issuance Costs and Discounts Amortization of Debt Issuance Costs and Discounts, Total Amortization expense related to deferred financing costs and original issue discount. Document Fiscal Year Focus Document Fiscal Year Focus Other Assets Other Assets [Member] CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Interest Expense, Nonoperating, Total Interest Expense, Nonoperating Interest expense Medicare Part D Medicare Part D [Member] Medicare Part D. Research and Development Expense Research and development R&D Expense Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Actual Credits Received Related To Duplicate Billings Actual credits received related to duplicate billings. Actual credits received related to duplicate billings Schedule of Contract Assets and Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total Issuance of ordinary shares under employee stock plans Finite-Lived Intangible Asset, Expected Amortization, Year One Expects to amortize of definite-lived intangible asset, 2027 Inventory amortization Inventory Amortization Inventory amortization. Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2027 Accounts Payable And Accrued Expenses [Line Items] Accounts payable and accrued expenses. Accrued Sales Discount Allowances And Reserves [Line Items] Business Combination, Revenue Growth that may be Anticipated [Table Text Block] Business combination, revenue growth that may be anticipated. Schedule of Revenue Growth that may be Anticipated Share-based compensation expense discontinued operations Share-based compensation expense discontinued operations Share-based compensation expense from discontinued operations Share-based compensation expense Other External Research and Development expenses Other external research and Development expenses. Other external R&D expenses Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Total recognized identifiable net assets acquired and liabilities assumed Disposal Group, Including Discontinued Operation, Liabilities Total liabilities Credit Agreement [Member] Credit agreement. Credit Agreement Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Debt Instrument Debt Instrument [Axis] Share-Based Payment Arrangement [Abstract] Available-for-sale securities: Debt Securities, Available-for-Sale [Abstract] Assets, Total Assets, Fair Value Disclosure Depreciation internal research and development expenses Depreciation internal research and development expenses. Depreciation Business Combination, Recognized Liability Assumed, Deferred Tax Liability Deferred tax liability Revenues, Total Revenues Revenue Intellectual Property [Member] Capitalized IP Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash flows (used in) provided by investing activities Number of Transition Service Agreement Number of transition service agreement. Number of transation service agreement Disposal group including discontinued operation assets and liabilities net. Disposal Group Including Discontinued Operation Assets and Liabilities Net Net assets transferred to Mural Disposal Group Including Discontinued Operation Assets and Liabilities Net, Total Title of 12(b) Security Title of 12(b) Security Senior Secured Term Loan A Facility [Member] Senior Secured Term Loan A Facility. Senior Secured Term Loan A Facility Share repurchase program remaining authorized amount Share Repurchase Program, Remaining Authorized, Amount After 1 year through 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Related Party Related and Nonrelated Parties [Domain] Lessee operating lease liability payments due after year four. Lessee Operating Lease Liability Payments Due After Year Four Thereafter Lessee Operating Lease Liability Payments Due After Year Four, Total Long-Term Debt, Maturity, after Year Five Thereafter Income Taxes Income Tax Disclosure [Text Block] Gross Unrealized Gains Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain 2023 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 2026 OTHER LONG-TERM LIABILITIES Other Liabilities, Noncurrent Former Term Loans [Member] Former Term Loans. Former Term Loans Legal Entity [Axis] After 1 year through 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Business Combination, Price Per Share Potential additional cash payment per share Business combination, price per share Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] After 1 year through 5 years Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised, Total Proceeds from the issuance of ordinary shares under share-based compensation arrangements Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Income Tax Disclosure [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Business Combination [Text Block] Business Combination Additional Paid-In Capital Additional Paid-in Capital [Member] Separation agreement . Separation Agreement [Member] Separation Agreement Non-Rule 10b5-1 Arr Modified [Flag] Non-Rule 10b5-1 Arrangement Modified [Flag]. Non-Rule 10b5-1 Arrangement Modified Other Other Products And Services [Member] Other products and services. Measurement Frequency Measurement Frequency [Domain] Other (Expense) Income, Net Other Operating Income (Expense) [Member] Share repurchase aggregate amount Share Repurchase Program, Authorized, Amount Income Statement Location Statement of Income Location, Balance [Axis] Trading Symbol Trading Symbol Intangible Asset, Finite-Lived [Table] Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] Within 1 year Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Axis] Realized losses Marketable Securities Realized Loss Represents the loss realized on the sale of debt or equity securities categorized as held-to-maturity, trading securities and available-for-sale. Employee-related Liabilities, Current, Total Accrued compensation Employee-related Liabilities, Current State Medicaid rebates. State Medicaid Rebates [Member] State Medicaid Rebates CASH FLOWS FROM FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Recurring Basis Fair Value, Recurring [Member] Accounts Payable and Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Total operating lease payments Lessee, Operating Lease, Liability, to be Paid Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Total Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Selling and Marketing Expense Selling and Marketing Expense, Total Selling and marketing expense Amounts recognized into other (expense) income, net Contract With Customer Liability Other (Expense) Income Net Recognized Contract with customer liability other (expense) income net recognized. Employee-Related Internal Research and Development Expenses Employee-related internal research and development expenses. Employee-related Equity Components Equity Components [Axis] Nonoperating Income (Expense) Total other (expense) income, net Equity Component Equity Component [Domain] Assets held for sale. Assets Held for Sale [Policy Text Block] Assets Held for Sale Asset Class Asset Class [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Schedule of Assets Acquired and Liabilities Assumed Business Combination [Axis] Fair value of guarantee Guarantees, Fair Value Disclosure Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Cash Consideration Paid Business combination recognized identifiable assets acquired and liabilities assumed cash consideration paid. Total Cash Consideration Paid Total Cash Consideration Paid Building and Improvements Building and Building Improvements [Member] Senior Secured Term Loan B Facility [Member] Senior secured term loan B facility. Senior Secured Term Loan B Facility Maximum Maximum [Member] Liabilities, Fair Value Disclosure Liabilities, Total Statistical Measurement Statistical Measurement [Axis] Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Receivables, Net, Current, Total Receivables, net Receivables, Net, Current Receivables Common Stock, Value, Issued Ordinary shares, par value, $0.01 per share; 450,000,000 shares authorized; 183,592,868 and 181,011,166 shares issued; and 166,462,299 and 165,607,028 shares outstanding at March 31, 2026 and December 31, 2025, respectively Property, Plant and Equipment, Net Property, Plant and Equipment [Member] Guaranty Date Guaranty Date Guaranty date Line of Credit Facility, Expiration Date Line of credit facility maturity date Principles of Consolidation Consolidation, Policy [Policy Text Block] Goodwill [Roll Forward] Secured Overnight Financing Rate (SOFR) [Member] SOFR Royalty Royalty [Member] Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] COMPREHENSIVE (LOSS) INCOME: Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] Treasury Stock, Value, Acquired, Cost Method Excluding commission Treasury Stock, Value, Acquired, Cost Method Excluding commission. Shares repurchased value Business Combination, Pro Forma Information, Nonrecurring Adjustment [Domain] Preferred stock shares, authorized Preferred Stock, Shares Authorized Total expenses Costs and Expenses Finite-Lived Intangible Assets by Major Class [Axis] Definite-lived intangible assets: Long-term debt Schedule of Debt [Table Text Block] Employee taxes paid related to net share settlement of equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Lender Name [Axis] Summary of Current Provision for Sales, Discounts, Allowances and Reserves Schedule Of Accrued Sales Discounts Allowances And Reserves Table [Text Block] Schedule of accrued sales discounts allowances and reserves. Total accrued sales discounts, allowances and reserves Accrued sales discounts, allowances and reserves Accrued Sales Discounts Allowances And Reserves Carrying value as of the balance sheet date of obligations relating to sales discounts, allowances and reserves. Cash Consideration For Settlement Of Unvested Share Based Compensation Awards Cash consideration for settlement of unvested share based compensation awards. Cash consideration paid for cash settlement of Avadel equity awards Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Business Combination [Table] Entity Registrant Name Entity Registrant Name Finite-Lived Intangible Asset, Expected Amortization, Year Two Expects to amortize of definite-lived intangible asset, 2028 Shares repurchased Repurchase of Alkermes' ordinary shares (in shares) Repurchase of Alkermes' ordinary shares (in shares) Treasury Stock, Shares, Acquired Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Other (expense) income, net Subsequent Events [Abstract] Total accounts payable and accrued expenses Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Additions of property, plant and equipment, discontinued operations Additions of property, plant and equipment, discontinued operations Additions of property, plant and equipment Finite-Lived Intangible Asset, Expected Amortization, Year Three Expects to amortize of definite-lived intangible asset, 2029 Income Tax Expense (Benefit), Total Income tax benefits Income Tax Expense (Benefit) Income tax provisions on income from continuing operations INCOME TAX PROVISION Measurement Frequency Measurement Frequency [Axis] Operating Activities. Operating Activities [Abstract] OPERATING ACTIVITIES: EXPENSES: Costs and Expenses [Abstract] Schedule of Proceeds from Sales and Maturities of Marketable Securities Plus Resulting Realized Gains and Losses Proceeds And Realized Gain Loss On Marketable Securities Table [Text Block] Tabular disclosure of the proceeds from sales and maturities of marketable securities, plus the resulting realized gains and losses. Research and development revenue Research And Development [Member] Relating to research and development. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Payments to Acquire Property, Plant, and Equipment, Total Additions of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Commitments and contingencies. Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Gain (Loss), Foreign Currency Transaction, after Tax Gain (Loss), Foreign Currency Transaction, after Tax, Total Foreign currency translation loss Foreign currency translation loss Assets TOTAL ASSETS Finite-Lived Intangible Assets, Net [Abstract] Finite-lived intangible assets: Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Income Statement [Abstract] Product Returns [Member] Product returns. Product Returns Deferred Income Tax Expense (Benefit), Total Deferred income taxes Deferred Income Tax Expense (Benefit) Business Combination, Pro Forma Information [Table] Selling, General and Administrative Expense Selling, general and administrative Selling, General and Administrative Expenses [Member] Business Combination [Abstract] Earnings Per Share, Diluted Earnings (loss) per share - diluted (Loss) earnings per ordinary share - diluted (Loss) earnings per ordinary share - diluted Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Significant Segment Expenses REVENUES: Disaggregation of Revenue [Abstract] Disposal Group, Including Discontinued Operation, Assets Total assets Assets Term Loan B [Member] Term Loan B member. Term Loan B Facility, due August 12, 2031 City Area Code City Area Code Business Combination, Pro Forma Information, Pro Forma Revenue Business Combination, Total revenues Revenues Income tax benefit from discontinued operations Income tax benefit from discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation Schedule of Goodwill and Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Aggregate principal amount Line of Credit Facility, Maximum Borrowing Capacity Business Combination [Line Items] Counterparty Name Counterparty Name [Domain] Operating Lease, Weighted Average Remaining Lease Term Weighted average remaining lease term Segment Reporting Information [Line Items] Disposal Group Name [Axis] Lease Expiration Date Lease expiration year Disposal group including discontinued operation operating lease liabilities current. Disposal Group Including Discontinued Operation Operating Lease Liabilities Current Operating lease liabilities-short-term Total property, plant and equipment, net PROPERTY, PLANT AND EQUIPMENT, NET Property, Plant and Equipment, Net Property, plant and equipment Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Goodwill Operating Income (Loss) OPERATING (LOSS) INCOME OPERATING (LOSS) INCOME Accumulated Deficit Retained Earnings [Member] Entity Address, Country Entity Address, Country Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Share-Based Payment Arrangement, Noncash Expense, Total Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense L Y B A L V I External Research And Development Expenses Development Programs LYBALVI external research and development expenses development programs. LYBALVI Alixorexton Alixorexton External Research And Development Expenses Development Programs Alixorexton external research and development expenses development programs. Weighted average incremental borrowing rate Operating Lease, Weighted Average Discount Rate, Percent OPERATING LEASE LIABILITIES—LONG-TERM Operating Lease, Liability, Noncurrent Level 1 Fair Value, Inputs, Level 1 [Member] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash flows provided by financing activities ALKS 2680 A L K S Two Six Eight Zero External Research and Development Expenses Development Programs ALKS 2680 external research and development expense development programs. Ireland Revenue Commissioners, Ireland [Member] Deferred Income Tax Liabilities, Net DEFERRED TAX LIABILITIES Nonoperating Income (Expense) [Abstract] OTHER (EXPENSE) INCOME, NET: Business Combination, Recognized Asset Acquired, Receivable, Current Receivables Fair Value Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Anti-Dilutive Potential Common Share Equivalent Excluded from Calculation of Net (Loss) Earnings Per Ordinary Share Corporate debt securities Corporate Debt Securities [Member] Entity Interactive Data Current Entity Interactive Data Current Additions Contract With Customer Liability Additions Amount of increase in contract with customer liability during the period. Contract liabilities Increase (Decrease) in Contract with Customer, Liability Income Statement Location Statement of Income Location, Balance [Domain] CASH FLOWS FROM OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Contract with Customer, Asset, after Allowance for Credit Loss, Total Contract assets at beginning of period Contract assets at end of period Contract with Customer, Asset, after Allowance for Credit Loss Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Liability Addition of Contingent Consideration Transferred Fair value measurement with unobservable inputs reconciliation recurring basis liability addition of contingent consideration transferred. Addition of contingent consideration related to CVR Milestone for consideration transferred Entity Tax Identification Number Entity Tax Identification Number Land Land [Member] Long-Term Debt, Type [Axis] Income Tax Authority, Name [Domain] Local Phone Number Local Phone Number WEIGHTED AVERAGE NUMBER OF ORDINARY SHARES OUTSTANDING: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Denominator: Accounting Policies [Abstract] Allocated Share Based Compensation Expense Including Portion Of Acceleration Of Shares Allocated share based compensation expense including portion of acceleration of shares. Total share-based compensation expense Components of Accrued Sales Discounts, Allowances and Reserves Other Current Liabilities [Member] Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total revenues Royalty revenue Total revenues Total revenues Share-Based Payment Arrangement Plan Modification Additional Incremental Cost Share-based payment arrangement plan modification additional incremental cost. Share-based payment arrangement plan modification additional incremental cost Lessee, Operating Lease, Liability, to be Paid, Year Four 2030 Term Loan A [Member] Term Loan A member. Term Loan A Facility, due February 12, 2031 Schedule of Accounts Payable and Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Furniture, Fixtures and Equipment Furniture Fixture And Equipment [Member] Represents furniture, fixtures and equipment of the entity. Entity Emerging Growth Company Entity Emerging Growth Company Indefinite-Lived Intangible Assets [Axis] Indefinite-lived intangible asset: Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Preliminary fair value of total consideration Disposal Group, Including Discontinued Operation, Operating Income (Loss) Disposal Group, Including Discontinued Operation, Operating Income (Loss), Total