Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable, Current Accounts payable Accrued Liabilities and Other Liabilities Accrued compensation and other current liabilities Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less accumulated depreciation and amortization Additional operating lease office space. Additional Operating Lease Office Space Additional area of office space for headquarters facility Additional Paid in Capital, Common Stock Additional paid-in-capital Additional Paid-in Capital [Member] Additional Paid-In Capital [Member] Adjustable taxable income rate. Adjustable Taxable Income Rate Adjustable taxable income rate Amortization Amortization Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Less transaction costs Less transaction costs Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Allocated Share-based Compensation Expense Total stock compensation expense Stock-based compensation expense Stock-based compensation expense, discontinued operation Amendment Flag Amendment Flag Amortization expense for discontinued operations. Amortization Expense For Discontinued Operations Amortization expense of discontinued operations Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive securities excluded from computations of diluted weighted-average shares outstanding Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Area of Real Estate Property Area of real estate property (in sqft) Aspire Capital Fund Llc [Member] Aspire Capital Fund Llc [Member] Aspire Capital Fund, LLC [Member] Asset Acquisition, Capitalized Costs Asset Acquisition Capitalized Costs Capitalized costs Asset Acquisition, Legal Fees Asset Acquisition Legal Fees Legal fees Asset Acquisition, Other Fees Asset Acquisition Other Fees Accounting and other fees Asset Acquisition, Printing Fees Asset Acquisition Printing Fees Printing fees Assets Total assets Assets [Abstract] Assets Assets, Current Total current assets Assets, Current [Abstract] Current assets Assets, Fair Value Disclosure [Abstract] Assets Assets, Noncurrent [Abstract] Long-term assets Disposal Group, Including Discontinued Operation, Assets, Current Current assets held for sale Current assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current [Abstract] Current assets Disposal Group, Including Discontinued Operation, Assets, Noncurrent [Abstract] Long-term assets Award Type [Axis] Award Type [Axis] Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Board of directors. Board Of Directors [Member] Board of Directors [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Common stock shares issued in acquisition (shares) Shares issued in acquisition (in shares) Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Consideration Transferred Total purchase price consideration Business Combination, Consideration Transferred, Equity Interests Issued and Contingent Consideration Potentially Issuable Business Combination Consideration Transferred Equity Interests Issuedand Contingent Consideration Potentially Issuable Maximum total common stock issuable in acquisition (in shares) Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair value of stock consideration Business Combination, Consideration Transferred, Equity Interests Reserved For Indemnification Claims, Shares Business Combination Consideration Transferred Equity Interests Reserved For Indemnification Claims Shares Shares reserved for indemnification claims (shares) Business Combination, Consideration Transferred, Indemnification Claims Period Business Combination Consideration Transferred Indemnification Claims Period Indemnification claims period Business Combination, Consideration Transferred, Liabilities Incurred Amount of financing needed Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Milestone Achievement, Probability of Development Success Rate Business Combination Contingent Consideration Arrangements Milestone Achievement Probabilityof Development Success Rate Probability of development success rate (percent) Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Contingent consideration Maximum potential cash earnout payments Business Combination, Contingent Consideration Arrangements, Revenue Milestone, Year Eight Business Combination Contingent Consideration Arrangements Revenue Milestone in twenty twenty five Revenue milestone in 2025 Business Combination, Contingent Consideration Arrangements, Revenue Milestone, Year Six Business Combination Contingent Consideration Arrangements Revenue Milestone in twenty twenty three Revenue milestone in 2023 Business Combination, Contingent Consideration, Liability, Milestone, Potential Additional Shares Issuable Business Combination Contingent Consideration Liability Milestone Potential Additional Shares Issuable Contingent consideration potential additional shares issuable if milestones are reached (shares) Business Combination, Contingent Consideration, Liability, Noncurrent Contingent liability for Essentialis purchase price Fair value of contingent consideration Business Combination Disclosure [Text Block] Acquisition of Essentialis Inc. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Value of deferred tax liability assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Net intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Patents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Net Assets Acquired Business Combinations [Abstract] Business Combinations [Abstract] Business Combinations Policy [Policy Text Block] Business Combinations Business Description and Basis of Presentation [Text Block] Description of Business Capnia, Inc. Capnia, Inc. [Member] Capnia, Inc. [Member] Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Cash and cash equivalents Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents, Fair Value Disclosure Cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net decrease in cash and cash equivalents from discontinued operations Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Cashless exercise. Cash Less Exercise [Member] Cash Less Exercise [Member] Cashless Warrants Exercised Cashless Warrants Exercised Warrants cashless exercised (in shares) Cash paid for the cost issuance of common stock and common stock warrants. Cash paid for the cost issuance of common stock and common stock warrants Cash paid for the cost issuance of common stock and common stock warrants Cash Provided by (Used in) Financing Activities, Discontinued Operations Net cash provided by discontinued financing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash provided by (used in) discontinued investing activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash used in discontinued operations Changes Measurement [Member] Changes Measurement [Member] Change in fair value of contingent consideration policy. Change in Fair Value of Contingent Consideration Policy [Text Block] Change in Fair Value of Contingent Consideration Class of Stock [Domain] Class of Stock [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Class of Warrant or Right, Exercise Price Description Class of Warrant or Right, Exercise Price Description Warrant issuance description Class of Warrant or Right, Exercise Price of Warrants or Rights Warrant exercise price Exercise price of warrants (in dollars per share) Exercise price of warrants exercised Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Class of Warrant Or Right, Liquidated Damages Amount, Percent of Volume Weighted Average Price Classof Warrant Or Right Liquidated Damages Amount Percentof Volume Weighted Average Price Aggregate VWAP (percent) Liquidated damages amount percent of VWAP (percent) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Warrant to call common stock Class of Warrant or Right, Number of Securities Called by Warrants or Rights Number of common stock purchased upon issuance of warrants Warrants, to purchase shares of common stock Class of Warrant or Right, Outstanding Balance at the end of period, in shares Balance at the beginning of period, in shares Warrants outstanding (in shares) Class of Warrant or Right [Table] Class of Warrant or Right [Table] Class Of Warrant Or Right, Warrant Term Class Of Warrant Or Right Warrant Term Warrants term Commitments and Contingencies Commitments and contingencies (Note 7) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Common Stock, Capital Shares Reserved for Future Issuance Issuance of shares to Aspire Capital in lieu of commitment fees (Shares) Common Stock [Member] Common Stock [Member] Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock Purchase Agreement, Agreement Term Common Stock Purchase Agreement Agreement Term Purchase agreement term Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Value, Issued Common stock Common Stock Warrant Liability [Member] Common Stock Warrant Liability [Member] Common stock warrant liability [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Compensation Related Costs, General [Text Block] Compensation Plan for Board Members Components of Deferred Tax Assets [Abstract] Components of Deferred Tax Assets [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Computer Equipment [Member] Computer Hardware [Member] Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Number of Banks Concentration Risk Credit Risk Numberof Banks Number of commercial banks Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Consolidation, Policy [Policy Text Block] Principles of Consolidation Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Contingent liability payment on achievement of sales milestone. Contingent liability payment on achievement of sales milestone Contingent liability payment on achievement of sales milestone Conversion of Stock, Amount Issued Conversion of preferred to common stock Conversion of Stock, Shares Converted Number of shares converted Conversion of Stock, Shares Issued Number of shares issued upon conversion Convertible Debt Securities [Member] Warrants Issued to 2010/2012 Convertible Note Holders to Purchase Common Stock [Member] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Convertible Preferred Stock, Shares Issued upon Conversion Number of shares issued upon conversion Corporate Joint Venture [Member] Corporate Joint Venture [Member] CoSense and NFI [Member] Co Senseand N F I [Member] CoSense and NFI [Member] Costs of issuing common stock and common stock warrants recorded in accounts payable. Costs of issuing common stock and common stock warrants recorded in accounts payable Costs of issuing common stock and common stock warrants recorded in accounts payable Current Federal Tax Expense (Benefit) Federal Current Fiscal Year End Date Current Fiscal Year End Date Current Foreign Tax Expense (Benefit) Foreign Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current: Current State and Local Tax Expense (Benefit) State Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Federal Income Tax Expense (Benefit) Federal Deferred Foreign Income Tax Expense (Benefit) Foreign Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred Deferred Income Tax Liabilities, Net Tax liability recorded Deferred State and Local Income Tax Expense (Benefit) State Deferred Tax Assets, Capital Loss Carryforwards Capital loss carryover Deferred Tax Assets, Gross, Noncurrent Gross non-current deferred tax assets Deferred Tax Assets, Net Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract] Non-Current Deferred Tax Assets: Deferred Tax Assets, Operating Loss Carryforwards Net Operating Loss Carryforwards Deferred Tax Assets, Tax Credit Carryforwards Tax credit carryforwards Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Stock-based compensation-NSO Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Reserves and accruals Deferred Tax Assets, Valuation Allowance Valuation allowance Valuation allowance Deferred Tax Liabilities, Intangible Assets Intangible Assets Deferred Tax Liabilities, Net, Noncurrent Total non-current deferred tax liabilities Deferred Tax Liabilities, Property, Plant and Equipment Fixed Assets Depreciation Depreciation expense Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and Amortization, Discontinued Operations Depreciation expense, discontinued operations De-recognition Of Warrant Derivative Liability Derecognition Of Warrant Derivative Liability De-recognition of warrant liability Derivative Financial Instruments, Liabilities [Member] Convertible preferred stock warrant liability [Member] Derivative Liability, Noncurrent Warrant contingent consideration liability Warrant liability Derivatives, Policy [Policy Text Block] Common Stock Purchase Warrants and Other Derivative Financial Instruments Description Of Business [Table] Description Of Business [Table] Description Of Business [Table] Development Milestone [Member] Development Milestone [Member] Development Milestone [Member] Director [Member] Board Members [Member] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Loss resulting from discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Loss on sale of assets Loss on sale of assets, net of tax effect Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Operating loss Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share Loss per common share from discontinued operations, basic and diluted Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations, Held-for-sale [Member] Discontinued Operations, Held-for-sale [Member] Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation Net loss from discontinued operations, net of tax effect Taxes allocated to discontinued operations Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Assets Held for Sale [Member] Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Accounts receivable Disposal Group, Including Discontinued Operation, Accounts Payable, Current Accounts payable Disposal Group, Including Discontinued Operation, Accrued Compensation and Other Liabilities, Current Disposal Group Including Discontinued Operation Accrued Compensationand Other Liabilities Current Accrued compensation and other current liabilities Disposal Group, Including Discontinued Operation, Assets, Noncurrent Long-term assets held for sale Long-term assets held for sale Disposal Group, Including Discontinued Operation, Cost and Expenses Disposal Group Including Discontinued Operation Cost And Expense Total expenses Disposal Group, Including Discontinued Operation, Costs of Goods Sold Cost of product revenue Amount classified as deferred tax assetsor liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. Disposal Group, Including Discontinued Operation, Deferred Tax Assets, Liabilities, Noncurrent Assets held for sale Disposal Group, Including Discontinued Operation, General and Administrative Expense General and administrative Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent Goodwill Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Gross profit loss Disposal Group, Including Discontinued Operation, Intangible Assets Intangible assets classified as assets held for sale Disposal Group, Including Discontinued Operation, Inventory, Current Inventory Disposal Group, Including Discontinued Operation, Operating Income (Loss) Operating loss Disposal Group, Including Discontinued Operation, Other Expense Other income (expense) Disposal Group, Including Discontinued Operation, Other Intangible Assets, Noncurrent Disposal Group Including Discontinued Operation Other Intangible Assets Noncurrent Other intangible assets Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Other long-term liabilities Disposal Group, Including Discontinued Operation, Prepaid and Other Assets, Current Prepaid expenses and other current assets Disposal Group Including Discontinued Operation Product Revenue Disposal Group Including Discontinued Operation Product Revenue Product revenue Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Property & equipment, net Disposal Group, Including Discontinued Operation, Research and Development Disposal Group Including Discontinued Operation Research And Development Research and development Disposal Group, Including Discontinued Operation, Revenue Total revenue Disposal Group, Including Discontinued Operation, Sales and Marketing Disposal Group Including Discontinued Operation Salesand Marketing Sales and marketing Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Expenses Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Discontinued Operations and Assets Held for Sale