Agreement termination notice period Variable Interest Entity, Agreement Termination Notice, Period Variable Interest Entity, Agreement Termination Notice, Period Consolidated Entities [Axis] Consolidated Entities [Axis] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Change in fair value recognized in earnings Change in fair value recognized in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Pay vs Performance Disclosure [Line Items] Total Accrued Liabilities, Current Statistical Measurement [Domain] Statistical Measurement [Domain] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Research and development Research and Development Expense Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Accrued royalties Accrued Royalties, Current Award Type [Domain] Award Type [Domain] Fair Value as of Grant Date Award Grant Date Fair Value Investment, Name [Domain] Investment, Name [Domain] Nonvested, beginning balance (in shares) Nonvested, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Payments on Line of Credit Repayments of Short-Term Debt Debt Debt Disclosure [Text Block] Amortization of premium/discount on marketable securities Investment Income, Net, Amortization of Discount and Premium Other Current Liabilities Other Current Liabilities [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Investments, Debt and Equity Securities [Abstract] Revolving Credit Facility Revolving Credit Facility [Member] Schedule of unrestricted available-for-sale marketable securities Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] APOKYN and SPN-830 APOKYN And SPN-830 [Member] APOKYN And SPN-830 Deferred income tax liabilities, net Deferred Income Tax Liabilities, Net MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total PSUs Performance Shares [Member] Accounts payable Accounts Payable, Current Computer equipment Computer Equipment [Member] Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Restatement Determination Date: Restatement Determination Date [Axis] Investment, Name [Axis] Investment, Name [Axis] Corporate and municipal debt securities Corporate Debt Securities [Member] Total other income (expense) Nonoperating Income (Expense) Insider Trading Policies and Procedures [Line Items] Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Proceeds from issuance of common stock Proceeds from Issuance of Common Stock VIE, qualitative or quantitative information, ownership percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Income Tax Expense (Benefit) Income Tax Disclosure [Text Block] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Customer [Axis] Customer [Axis] Current liabilities Liabilities, Current [Abstract] Business Acquisition [Line Items] Business Acquisition [Line Items] Weighted Average Grant Date Fair Value per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Payment of contingent consideration Payment for contingent consideration liability, financing activities Payment for Contingent Consideration Liability, Financing Activities Raw materials Inventory, Work in Process and Raw Materials, Net of Reserves Diluted (in dollars per share) Earnings per share, diluted (in dollars per share) Earnings Per Share, Diluted PEO Total Compensation Amount PEO Total Compensation Amount Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accounting Standards Update [Extensible Enumeration] Accounting Standards Update [Extensible Enumeration] Vested and expected to vest (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Extinguishment of debt Extinguishment of Debt, Amount Line of Credit Line of Credit [Member] Outstanding at the beginning of the period (in shares) Outstanding at the end of the period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Payment for contingent consideration liability, operating activities Payment for Contingent Consideration Liability, Operating Activities Other income (expense) Other Nonoperating Income (Expense) [Abstract] Total fair value Total Debt Securities, Available-for-Sale, Excluding Accrued Interest Litigation Case [Axis] Litigation Case [Axis] Trading Symbol Trading Symbol Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Net earnings (loss) Net earnings (loss) Net Income (Loss) NAMENDA XR/Namzaric Qui Tam Litigation NAMENDA XR/Namzaric Qui Tam Litigation [Member] NAMENDA XR/Namzaric Qui Tam Litigation Total current liabilities Liabilities, Current Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Company Selected Measure Name Company Selected Measure Name Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Leases Lessee, Operating Leases [Text Block] Total intangible assets, carrying amount, gross Intangible Assets, Gross (Excluding Goodwill) Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Payment on convertible notes Repayments of Convertible Debt Additional cash payments upon milestone achievements minimum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Stockholders’ equity Equity, Attributable to Parent [Abstract] Gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Total carrying value Convertible Notes Payable, Noncurrent Schedule of computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Cost of goods sold Cost of Goods and Services Sold Amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss, Current Executive Category: Executive Category [Axis] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Number of RSUs Number of PSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Jack Khattar [Member] Jack Khattar Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Level 1 Fair Value, Inputs, Level 1 [Member] Name Measure Name Accrued product returns Accrued Product Returns Represents the amount of accrued product returns. Name Forgone Recovery, Individual Name Goodwill Goodwill Schedule of property and equipment Property, Plant and Equipment [Table Text Block] Equity Components [Axis] Equity Components [Axis] Strike price of the warrant transactions (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Financial Instruments [Domain] Financial Instruments [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Underlying Securities Award Underlying Securities Amount Entity Small Business Entity Small Business Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Local Phone Number Local Phone Number Accounts receivable Increase (Decrease) in Accounts Receivable Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Selling, general and administrative Selling, General and Administrative Expenses [Member] Milestone payments Milestone payments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Measurement Frequency [Axis] Measurement Frequency [Axis] Operating lease liabilities, long-term Operating lease liabilities, long-term Operating Lease, Liability, Noncurrent Schedule of contractual maturities of the unrestricted available-for-sale marketable securities held Investments Classified by Contractual Maturity Date [Table Text Block] RSUs Restricted Stock Units (RSUs) [Member] Summary of restricted stock units Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Cash distributions received Proceeds from Divestiture of Businesses and Interests in Affiliates Cumulative effect of adoption of ASU 2020-06 Cumulative Effect, Period of Adoption, Adjustment [Member] Long-term marketable securities Debt Securities, Available-for-Sale, Excluding Accrued Interest, Noncurrent Income Statement Location [Axis] Income Statement Location [Axis] Unamortized debt discount and deferred financing costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Other assets Other Assets, Noncurrent [Abstract] Milestone 2024 Milestone 2024 [Member] Milestone 2024 Schedule of common stock equivalents excluded in the calculation of diluted earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Product and Service [Domain] Product and Service [Domain] Other Performance Measure, Amount Other Performance Measure, Amount Interest expense Interest expense Interest Expense, Debt Aggregate Available Trading Arrangement, Securities Aggregate Available Amount APOKYN APOKYN [Member] APOKYN Inventories Increase (Decrease) in Inventories Research and development Research and Development Expense [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Common stock equivalents excluded in the calculation of diluted income per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Award Type [Axis] Award Type [Axis] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Document Quarterly Report Document Quarterly Report Noncash investing and financing activities Noncash Investing and Financing Items [Abstract] Interest expense Interest Expense Property and equipment additions from utilization of tenant improvement allowance Capital Expenditures Incurred but Not yet Paid Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Property and equipment, gross Property, Plant and Equipment, Gross Outstanding at the end of the period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Lease assets obtained for new operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Trading Arrangement: Trading Arrangement [Axis] Schedule of interest expense Interest Income and Interest Expense Disclosure [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount After-tax interest expense for 2023 Notes Interest on Convertible Debt, Net of Tax Entity File Number Entity File Number Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Operating lease liabilities, current portion Operating Lease, Liability, Current Software Computer Software, Intangible Asset [Member] Marketable securities Debt Securities, Current [Abstract] Sales and maturities of marketable securities Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Amortization of intangible assets Amortization of intangible assets Amortization of Intangible Assets Entity Shell Company Entity Shell Company Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property and equipment Property, Plant and Equipment [Line Items] Carrying Amount, Net Finite-Lived Intangible Assets, Net Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Restatement Determination Date Restatement Determination Date Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Accrued product rebates Accrued Rebates Represents the amount of accrued rebates. SPN-830 NDA Approval Milestone SPN-830 NDA Approval Milestone [Member] SPN-830 NDA Approval Milestone Impairment due to credit losses Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Common stock shares issued (in shares) Common Stock, Shares, Issued Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Security Exchange Name Security Exchange Name Total assets at fair value Assets, Fair Value Disclosure Long-term debt Long-Term Debt Selling, general and administrative Selling, General and Administrative Expense Accumulated other comprehensive loss, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax USWM Acquisition MDD US Enterprises LLC (Formerly USWM Enterprises) [Member] MDD US Enterprises LLC (Formerly USWM Enterprises) Employee Stock Option Employee Stock Option [Member] 1 year to 2 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year Two Fair value of available-for-sale debt securities maturing after the first year through the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Total costs and expenses Costs and Expenses Maximum Maximum [Member] Comprehensive earnings (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Document Type Document Type Total Other Nonoperating Expense Market-Based Units Market Based Units [Member] Market Based Units Tabular List, Table Tabular List [Table Text Block] Type of Adoption [Domain] Accounting Standards Update [Domain] Entity Address, Address Line One Entity Address, Address Line One USB Bank USA Credit Facility USB Bank USA Credit Facility [Member] USB Bank USA Credit Facility Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Accrued product returns and rebates Total Accrued Product Returns and Rebates. Carrying value as of the balance sheet date of accrued product returns and rebates. Share-Based Payments Share-Based Payment Arrangement [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other noncash adjustments, net Other Noncash Income (Expense) Other income from Navitor (see Note 4) Equity Method Investment, Realized Gain (Loss) on Disposal Purchases of marketable securities Payments to Acquire Debt Securities, Available-for-Sale Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Contingent consideration arrangements, value (in dollars per share) Business Combination, Contingent Consideration Arrangements, Value, Price Per Share Business Combination, Contingent Consideration Arrangements, Value, Price Per Share Business Acquisition [Axis] Business Acquisition [Axis] Customer Concentration Risk Customer Concentration Risk [Member] Other current liabilities Other Liabilities, Current Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Cash Cash [Member] Income Statement [Abstract] Income Statement [Abstract] Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Issuance of common stock in connection with the Company’s equity award plans (in shares) Stock Issued During Period, Shares, New Issues Costs and expenses Costs and Expenses [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Title of 12(b) Security Title of 12(b) Security Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Cash, Restricted Cash and Money market funds Cash and Cash Equivalents, Fair Value Disclosure Accrued product returns and rebates Increase (Decrease) In Accrued Product Returns And Rebates Amount of increase (decrease) in product returns and rebates. Acquired in-process research and development Indefinite-Lived Intangible Assets (Excluding Goodwill) Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Nonvested, beginning balance (in dollars per share) Nonvested, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Schedule of financial liabilities that are not carried at fair value Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Marketable securities - restricted (SERP) Assets for Plan Benefits, Defined Benefit Plan Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Entity Tax Identification Number Entity Tax Identification Number Other Commitments [Domain] Other Commitments [Domain] Inventories, net Total inventories Inventory, Net Statistical Measurement [Axis] Statistical Measurement [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Entity Interactive Data Current Entity Interactive Data Current Nonrecourse Royalty Liabilities Nonrecourse Royalty Liabilities [Member] Nonrecourse Royalty Liabilities Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Advertising Expense Advertising Cost [Policy Text Block] Total Shareholder Return Amount Total Shareholder Return Amount Net product sales Product [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Variable Interest Entity, Not Primary Beneficiary Variable Interest Entity, Not Primary Beneficiary [Member] Share-Based Payments Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Retained earnings Retained Earnings (Accumulated Deficit) Measure: Measure [Axis] Threshold for development costs payments Collaborative Arrangement, Threshold For Development Costs Payments Collaborative Arrangement, Threshold For Development Costs Payments Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Name Outstanding Recovery, Individual Name 2023 Notes Debt Instrument, Face Amount Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Current assets Assets, Current [Abstract] Leases [Abstract] Leases [Abstract] Advertising costs Advertising Expense Entity Address, State or Province Entity Address, State or Province Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Income per share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Cash paid for operating leases Operating Lease, Payments Unrealized gain (loss) on marketable securities, net of tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Common stock shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Conversion price, per share of common stock (in dollars per share) Debt Instrument, Convertible, Conversion Price Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] PEO PEO [Member] Capitalized patent defense costs Patent Defense Costs [Member] Represents information concerning the capitalized patent defense costs related to the Watson litigation. Accrued R&D expenses Accrued Research and Development Expenses, Current Represents the amount of clinical trial and clinical supply costs accrued. Proceeds from Line of Credit Proceeds from Short-Term Debt Convertible notes, net Carrying Value Convertible Notes Payable, Current Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Customer [Domain] Customer [Domain] Numerator for dilutive earnings per share Net Income (Loss) Available to Common Stockholders, Basic Schedule of inventories Schedule of Inventory, Current [Table Text Block] Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Debt Instrument [Axis] Debt Instrument [Axis] Contingent Consideration Contingent Consideration Disclosure [Text Block] Contingent Consideration Disclosure Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Effective tax rate Effective Income Tax Rate Reconciliation, Percent Repayments of debt Repayments of Debt Total lease liabilities Operating Lease, Liability Credit Facility [Axis] Credit Facility [Axis] Total liabilities Liabilities Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Share-based payments Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Balance, January 1, 2022 Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accumulated Other Comprehensive Earnings (Loss) AOCI Attributable to Parent [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Measurement Frequency [Domain] Measurement Frequency [Domain] All Executive Categories All Executive Categories [Member] Schedule of balance sheet information related to leases Lessee, Operating and Finance Lease, Balance Sheet Disclosure [Table Text Block] Lessee, Operating and Finance Lease, Balance Sheet Disclosure Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Common stock, $0.001 par value; 130,000,000 shares authorized; 54,592,901 and 54,253,796 shares issued and outstanding as of June 30, 2023 and December 31, 2022, respectively Common Stock, Value, Issued Organization, Consolidation and Presentation of Financial Statements [Abstract] Accrued sales & marketing Accrued Professional Fees, Current Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Trokendi XR Trokendi Xr [Member] Represents information pertaining to Trokendi XR patent litigation. Total current assets Assets, Current Contingent consideration Contingent consideration Business Combination, Contingent Consideration, Liability All Individuals All Individuals [Member] Supplemental cash flow information Supplemental Cash Flow Information [Abstract] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Litigation Case [Domain] Litigation Case [Domain] Interest and other income, net Other Nonoperating Income (Expense) Entity Filer Category Entity Filer Category Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Short-Term Debt, Type [Domain] Short-Term Debt, Type [Domain] Statement [Table] Statement [Table] Contingent consideration, long-term Business Combination, Contingent Consideration, Liability, Noncurrent Current Fiscal Year End Date Current Fiscal Year End Date Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Schedule of effective income tax rate reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] PEO Name PEO Name Concentration risk percentage Concentration Risk, Percentage Balance at December 31, 2022 Balance at June 30, 2023 (unaudited) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Weighted Average Remaining Contractual Term (in years) Share Based Compensation Arrangement by Share Based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Warrants issued (in shares) Class of Warrant or Right, Outstanding Accounting Standards Update 2020-06 Accounting Standards Update 2020-06 [Member] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Interest Expense Other Nonoperating Income and Expense [Text Block] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Contingent consideration, current portion Business Combination, Contingent Consideration, Liability, Current Interest expense on nonrecourse liability related to sale of future royalties Interest Expense, Other Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Corporate and municipal debt securities Debt Securities, Available-for-Sale, Current Other accrued expenses Other Accrued Liabilities, Current Convertible notes Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Product Concentration Risk Product Concentration Risk [Member] Business Organization Nature of Operations [Text Block] Depreciation and amortization Depreciation, Depletion and Amortization Payment to resolve U.S. Department of Justice allegations Litigation Settlement, Amount Awarded to Other Party Restricted Cash and Cash Equivalents Items [Line Items] Restricted Cash and Cash Equivalents Items [Line Items] Interest rate Debt Instrument, Interest Rate, Stated Percentage Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Three Major Customers Three Major Customers [Member] Three Major Customers Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Convertible note hedge options issued (in shares) Debt Conversion, Converted Instrument, Warrants or Options Issued Business Combination and Asset Acquisition [Abstract] Total stockholders’ equity Balance Balance Stockholders' equity Equity, Attributable to Parent Realized gains from sales of marketable securities Debt Securities, Available-for-Sale, Realized Gain Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Convertible Notes Convertible Notes Payable [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Earnings (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Lab equipment and furniture Lab Equipment And Furniture [Member] Represents information pertaining to lab equipment and furniture. Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Level 2 Fair Value, Inputs, Level 2 [Member] Contingent consideration arrangements, excess acquisition date fair value Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Excess Acquisition Date Fair Value Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Excess Acquisition Date Fair Value Entity Emerging Growth Company Entity Emerging Growth Company Earnings (loss) per share EPS Basic And Diluted [Abstract] EPS Basic And Diluted Intangible assets, net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Marketable securities Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Document Fiscal Period Focus Document Fiscal Period Focus Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Stock options, RSUs, PSUs Share-Based Payment Arrangement [Member] Title Trading Arrangement, Individual Title Outstanding at the beginning of the period (in dollars per share) Outstanding at the end of the period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Number of shares per warrant entitled to holder (in shares) Class of Warrant or Right, Number of Shares in Which Holder Can be Entitled per Warrants at Strike Price Represents the information pertaining to the shares per warrant entitled to holders at strike price. Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Common Stock Common Stock [Member] Allowance for expected sales discounts and allowances Allowance for Expected Sales deductions Represents the allowance for sales discounts related to prompt-pay discounts and contractual fee for service arrangements to wholesalers and distributors. Corporate and municipal debt securities Debt Securities, Available-for-Sale, Noncurrent Contingent consideration Increase (Decrease) In Contingent Consideration Increase (Decrease) In Contingent Consideration Individual: Individual [Axis] Contingents value rights Business Combination, Contingent Consideration, Number Of Contingent Value Rights Per Common Share Business Combination, Contingent Consideration, Number Of Contingent Value Rights Per Common Share City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Earnings (Loss) per Share Earnings Per Share [Text Block] Product and Service [Axis] Product and Service [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Royalty revenues Royalty [Member] Reconciliation of the beginning and ending balances related to the contingent consideration Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Summary of stock options and SAR activities Share-Based Payment Arrangement, Option, Activity [Table Text Block] Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Additional cash payments upon milestone achievements maximum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Other Manufactured Product, Other [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Assets Assets [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of accrued product returns and rebates Schedule of Accrued Product Returns and Rebates [Table Text Block] Tabular disclosure of the accrued product returns and rebates. 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Insider Trading Arrangements [Line Items] Schedule of fair value of the financial assets and liabilities Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Schedule of Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Stock options, RSU and SAR (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Adjustment to Compensation, Amount Adjustment to Compensation Amount Contingent consideration expense (gain) Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Adoption Date Trading Arrangement Adoption Date Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Entity Central Index Key Entity Central Index Key Amortization of deferred financing costs and debt discount Amortization of Debt Issuance Costs and Discounts Liabilities: Liabilities, Fair Value Disclosure [Abstract] Total Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Carrying Amount, Gross Finite-Lived Intangible Assets, Gross Income tax expense (benefit) Income Tax Expense (Benefit) Finished goods Inventory, Finished Goods, Net of Reserves Accrued compensation, benefits, & related accruals Employee-related Liabilities, Current Fair Value of Financial Measurements Fair Value Disclosures [Text Block] Number of operating segments Number of Operating Segments Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalents [Abstract] Other comprehensive gain (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Summary of disaggregation of revenues by nature Disaggregation of Revenue [Table Text Block] Issuance of common stock in connection with the Company’s equity award plans Stock Issued During Period, Value, New Issues Performance-Based Units Performance Based Units [Member] Performance Based Units Total revenues Revenue from Contract with Customer, Excluding Assessed Tax Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Amendment Flag Amendment Flag Money market securities and funds Money Market Funds [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Summary of performance stock unit Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash paid for interest on debt Interest Paid, Excluding Capitalized Interest, Operating Activities Assets: Assets, Fair Value Disclosure [Abstract] Less than 1 year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Credit Facility [Domain] Credit Facility [Domain] Adamas Acquisition Adamas [Member] Adamas Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Loss contingency, damages sought, value Loss Contingency, Damages Sought, Value Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Nonrecourse liability related to sale of future royalties, long term Non Recourse Debt Sale of Future Royalties Noncurrent Noncurrent portion of debt, net of the amount due within one year or the normal operating cycle, if longer, related to the sale of future royalties, for which the creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property. Leasehold improvements Leasehold Improvements [Member] Net deferred tax liabilities Deferred Tax Liabilities, Net Diluted (in shares) Weighted average shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Oxtellar XR Oxtellar X R [Member] Represents information pertaining to Oxtellar XR product. Other commitment Other Commitment Long-term marketable securities Debt Securities, Noncurrent [Abstract] Disaggregated Revenues Revenue from Contract with Customer [Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Navitor Pharmaceuticals, Inc. Navitor Pharmaceuticals, Inc. [Member] Navitor Pharmaceuticals, Inc. Additional  Paid-in Capital Additional Paid-in Capital [Member] Effect of dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] GOCOVRI GOCOVRI [Member] GOCOVRI Contingent consideration arrangements, excess acquisition date fair value, term Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Excess Acquisition Date Fair Value, Term Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Excess Acquisition Date Fair Value, Term Balance Sheet Location [Axis] Balance Sheet Location [Axis] Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover page. 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