Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable, Current Accounts payable Accrued Liabilities and Other Liabilities Accrued compensation and other current liabilities 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 Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss from continuing operations 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 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 Total 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, 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, Finite-Lived Intangibles Patents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Net Assets Acquired Business Combinations [Abstract] Business Combinations [Abstract] 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 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 included in current assets held for sale. Cash And Cash Equivalents Period Increase Decrease Included In Current Assets Held For Sale Net increase in cash and cash equivalents included in current assets held for sale Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash, beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net increase (decrease) in cash, cash equivalents and restricted cash Cashless Warrants Exercised Cashless Warrants Exercised Warrants cashless exercised (in shares) 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 used in discontinued investing activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash used in discontinued operating activities Changes Measurement [Member] Changes Measurement [Member] 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 [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] Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Compensation Related Costs, General [Text Block] Compensation Plan for Board Members Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] 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, 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] 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 Fiscal Year End Date Current Fiscal Year End Date 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] Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization 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 Description Of Business [Table] Description Of Business [Table] Description Of Business [Table] Development Milestone [Member] Development Milestone [Member] Development Milestone [Member] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 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] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] 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 Total long-term assets held for sale Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Cash and cash equivalents 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 Disposal Group, Including Discontinued Operation, General and Administrative Expense General and administrative Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Gross profit 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 and 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, 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 Disposal Group Name [Domain] Disposal Group Name [Domain] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share [Abstract] Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted Net loss per common share, basic and diluted Earnings Per Share [Text Block] Net loss per share Earnout Payments [Member] Earnout Payments [Member] Earnout Payments [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Future stock-based compensation, requisite service period Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Future stock-based compensation for unvested employee options granted and outstanding Employee Stock [Member] Employee Stock Purchase Plan [Member] Employee Stock Option [Member] Stock Options [Member] Entity Central Index Key Entity Central Index Key Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Registrant Name Entity Registrant Name Equity [Abstract] Equity [Abstract] Equity and stock based compensation. Equity And Stock Based Compensation [Abstract] Equity And Stock Based Compensation [Abstract] Equity Component [Domain] Equity Component [Domain] Equity Method Investment, Ownership Percentage Ownership interest (percent) Equity Method Investments Investment Equity Unit Purchase Agreements [Member] Equity Unit Purchase Agreements [Member] Essentialis, Inc. Essentialis Inc. [Member] Essentialis, Inc. [Member] Fair Value Adjustment of Warrants (Increase) decrease in the fair value of warrants liabilities Change in fair value of stock warrants Change in fair value of warrants liabilities Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Summary of Financial Instruments Measured at Fair Value on Recurring Basis Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] Fair Value of Convertible Preferred Stock Warrant Liability Fair Value Assumptions, Expected Dividend Rate Expected dividend yield Fair Value Assumptions, Expected Term Expected Term Fair Value Assumptions, Expected Volatility Rate Volatility Fair Value Assumptions, Risk Free Interest Rate Risk-free rate Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Liability Class [Axis] Liability Class [Axis] Measurement Basis [Axis] Measurement Basis [Axis] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value of Financial Instruments Fair Value Inputs, Discount Rate Fair value inputs, discount rate (percent) Fair Value, Inputs, Level 1 [Member] Level 1 [Member] Fair Value, Inputs, Level 3 [Member] Level 3 [Member] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of Changes in Fair Value of Level1 and Level 3 Financial Instruments Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Change in value of Warrant Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Balance at end of period Balance at the beginning of period Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] Finite-lived Intangible Assets Acquired Total intangible asset Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] First commercial sales milestone. First commercial sales milestone First commercial sales milestone Gain (Loss) on Contract Termination Cease-use income (expense) General and Administrative Expense General and administrative General and Administrative Expense [Member] General and Administrative [Member] Incentive Stock Options [Member] Incentive Stock Options [Member] ISOs [Member] Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Loss from continuing operations Loss from continuing operations Income (Loss) from Continuing Operations, Per Basic and Diluted Share Loss per common share from continuing operations, basic and diluted Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Loss from discontinued operations Net loss from discontinued operations Income Statement [Abstract] Income Statement [Abstract] Disposal Group Name [Axis] Disposal Group Name [Axis] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued compensation and other current liabilities Increase (Decrease) in Operating Capital [Abstract] Change in operating assets and liabilities: Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Indemnification Claims [Member] Indemnification Claims [Member] Indemnification Claims [Member] Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Investment Company, Capital Share Transactions [Abstract] Investment Company, Capital Share Transactions [Abstract] IPO [Member] IPO [Member] Legal Entity [Axis] Legal Entity [Axis] Lessee Leasing Arrangements, Operating Leases, Increases to Monthly Payments, Term Lessee Leasing Arrangements Operating Leases Increasesto Monthly Payments Term Period of increases to monthly payments Lessee, Operating Lease, Term of Contract Non-cancelable operating lease agreement term Liabilities Total liabilities Liabilities and Equity Total liabilities and stockholders' equity Liabilities and Equity [Abstract] Liabilities and stockholders' equity Liabilities, Current Total current liabilities Liabilities, Current [Abstract] Current liabilities Liabilities, Fair Value Disclosure [Abstract] Liabilities Liabilities, Noncurrent [Abstract] Long-term liabilities Disposal Group, Including Discontinued Operation, Liabilities, Current Current liabilities held for sale Total current liabilities for sale Disposal Group, Including Discontinued Operation, Liabilities, Current [Abstract] Current liabilities Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Long-term liabilities held for sale Total long-term liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent [Abstract] Long-term liabilities Liquidity And Managements Plans [Line Items] Liquidity And Managements Plans [Line Items] Liquidity And Managements Plans [Line Items] Liquidity And Managements Plans [Table] Liquidity And Managements Plans [Table] Liquidity And Managements Plans [Table] Maximum [Member] Maximum [Member] Maximum value of shares for issuance under securities purchase agreement. Maximum Value Of Shares For Issuance Under Securities Purchase Agreement Maximum commitment under stock purchase agreement Minimum [Member] Minimum [Member] Money Market Funds [Member] Money market fund [Member] NeoForce Holdings Inc. Neo Force Holdings Inc. [Member] NeoForce Holdings Inc. [Member] Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by (used in) continuing financing activities Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in continuing operating activities Net Income (Loss) Attributable to Parent Net loss Net loss New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Standards Non-cash expense on shares issued. Non-cash Expense on Shares Issued Non-cash expense of issuing shares to Aspire Capital Noncash Investing and Financing Items [Abstract] Supplemental disclosures of non-cash investing and financing information Noncash or part noncash acquisition, contingent consideration. Noncash Or Part Noncash Acquisition Contingent Consideration Contingent cash consideration of Essentialis acquisition Nonoperating Income (Expense) [Abstract] Other income (expense) OAHL. OAHL [Member] OAHL [Member] Operating Expenses Total operating expenses Operating Expenses [Abstract] Operating expenses Operating Income (Loss) Operating loss Operating Leases, Future Minimum Payments Due Future minimum commitment under non-cancelable operating lease Operating Leases, Rent Expense, Net Rent expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Other Assets, Noncurrent Other assets Other Liabilities, Noncurrent Other liabilities Other Noncash Expense Board fees paid with common stock Other Nonoperating Income (Expense) Total other income (expense) Other Nonrecurring (Income) Expense Interest and other income (expense) Ownership Interest, Percentage of Voting Rights of Stock Ownership Interest Percentageof Voting Rightsof Stock Ownership interest of voting rights of all classes of stock (percent) Patents [Member] Patents [Member] Payments of Stock Issuance Costs Cash paid for the issuance cost of common stock and common stock warrants Payments to Acquire Businesses, Gross Fair value of cash consideration Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Preferred Stock, Par or Stated Value Per Share Convertible preferred stock, par value (in dollars per share) Preferred stock par value (in dollars per share) Preferred Stock, Shares Authorized Convertible preferred stock, shares authorized Preferred stock shares authorized Preferred Stock, Shares Issued Preferred stock shares issued Preferred Stock, Shares Outstanding Convertible preferred stock, shares outstanding Preferred Stock, Stated Value Per Share Preferred Stock Stated Value Per Share Convertible preferred stock, stated value (in dollars per share) Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Proceeds from Divestiture of Businesses Proceeds from the sale of business Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Proceeds from issuance of common stock under tender offer Proceeds from issuance or sale of equity gross Proceeds From Issuance Or Sale Of Equity Gross Gross Proceeds from issuance of units Proceeds from Warrant Exercises Proceeds from exercise of warrants Property, Plant and Equipment, Net Property and equipment, net Purchase price contingent liability. Purchase price contingent liability [Member] Purchase price contingent liability [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Related Party [Domain] Related Party [Domain] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Related Party [Axis] Related Party [Axis] Research and Development Expense Research and development Research and Development Expense [Member] Research and Development [Member] Restricted Cash and Cash Equivalents, Current Restricted cash Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units [Member] Retained Earnings (Accumulated Deficit) Accumulated deficit Sabby Management Llc [Member] Sabby Management Llc [Member] Sabby Management, LLC [Member] Sale of Stock [Domain] Sale of Stock [Domain] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Potentially Dilutive Securities Outstanding Excluded from Computations of Diluted Weighted-Average Shares Outstanding Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Purchase Price Consideration Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Disposal Groups, Including Discontinued Operations [Table Text Block] Components of Discontinued Operations Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of Stock Based Compensation Expense Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Fair Values of Assets Acquired Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Option Transactions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Fair Value of Award Granted Using Black-Scholes Option Pricing Model Second commercial sales milestone. Second commercial sales milestone Second commercial sales milestone Continuing Operations [Member] Continuing Operations [Member] Discontinued Operations [Member] Discontinued Operations [Member] Operating Activities [Domain] Operating Activities [Domain] Selling and Marketing Expense Sales and marketing Series A Warrants [Member] Series A- Warrants [Member] Series A Warrant Liability [Member] Series A Warrants to Purchase Common Stock [Member] Series A- Warrants to Purchase Common Stock [Member] Series A Warrants to Purchase Shares of Common Stock [Member] Series B Preferred Stock [Member] Series B Convertible Preferred Stock [Member] Series B Warrants [Member] Series B Warrants [Member] Series B Warrant Liability [Member] Series C Warrants [Member] Series C Warrants [Member] Series C Warrant [Member] Series C Warrant To Purchase Common Stock [Member] SeriesC Warrant To Purchase Common Stock [Member] Series C Warrant to Purchase Common Stock [Member] Series D Warrants [Member] Series D Warrants [Member] Series D Warrants [Member] Series D Warrant To Purchase Common Stock [Member] Series D Warrant To Purchase Common Stock [Member] Series D Warrant To Purchase Common Stock [Member] Share-based Compensation Stock-based compensation expense Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Vesting percentage Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Stock units granted Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Contractual term of option Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Dividend rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected life (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Number of additional shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options canceled/forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of options granted Options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value per option granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Sharebased Compensation Arrangementby Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward] Weighted-Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Stock options outstanding, intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Ending balance Beginning balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Ending balance (in dollars per share) Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options outstanding at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options vested and expected to vest at end of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options vested and expected to vest at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options vested and expected to vest at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Weighted Average Remaining Contractual Term Sharebased Compensation Arrangementby Sharebased Payment Award Options Vestedin Period Weighted Average Remaining Contractual Term Options vested at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Options vested at end of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Options vested at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum Percentage of outstanding stock maximum Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Percentage of fair market value Equity Award [Domain] Equity Award [Domain] Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options canceled/forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options granted (in dollars per share) Share Price Share price (in usd per share) Shares Issued, Price Per Share Price per unit Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Class of Stock [Axis] Class of Stock [Axis] Equity Components [Axis] Equity Components [Axis] Statement [Line Items] Statement [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Operating Activities [Axis] Operating Activities [Axis] Statement [Table] Statement [Table] Stockholders' Equity Attributable to Parent Total stockholders' equity Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Stockholders' Equity Note, Stock Split, Conversion Ratio Conversion ratio Reverse stock split Stock Issued Issuance of common stock in Essentialis acquisition Stock Issued During Period Shares Cashless Exercise Of Warrants Stock Issued During Period Shares Cashless Exercise Of Warrants Issuance of shares upon cashless exercise warrants (in shares) Stock Issued During Period, Shares, Issued for Services Issuance of common stock to board members in lieu of cash payments for quarterly board fees (shares) Stock Issued During Period, Shares, New Issues Number of newly issued Number of shares issued Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options exercised Equity Option [Member] Options to Purchase Common Stock [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Subsequent Event [Member] Subsequent Event [Member] Subsequent Events [Abstract] Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Event Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Sale of Stock [Axis] Sale of Stock [Axis] Substantial Doubt about Going Concern [Text Block] Going Concern and Management's Plans Temporary Equity, Carrying Amount, Attributable to Parent Convertible preferred stock Temporary Equity, Liquidation Preference Convertible preferred stock, aggregate liquidation preference Temporary Equity, Shares Authorized Convertible preferred stock, shares designated Temporary Equity, Shares Issued Convertible preferred stock, shares issued Temporary Equity, Shares Outstanding Convertible preferred stock, shares outstanding Text Block [Abstract] Text Block [Abstract] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Trading Symbol Trading Symbol Twenty Sixteen Sabby Purchase Agreement [Member] Twenty Sixteen Sabby Purchase Agreement Member 2016 Sabby Purchase Agreement [Member] Two Thousand and Ten and Two Thousand and Twelve Convertible Promissory Notes [Member] Two Thousand and Ten and Two Thousand and Twelve Convertible Promissory Notes [Member] 2010 and 2012 Convertible Promissory Notes [Member] 2017 PIPE warrant liability. Two Thousand Seventeen PIPE Warrant liability [Member] 2017 PIPE Warrant Liability [Member] 2017 PIPE warrant liability to purchase common stock. 2017 PIPE Warrant Liability to Purchase Common Stock [Member] 2017 PIPE Warrant Liability to Purchase Common Stock [Member] Underwriter [Member] Underwriter [Member] Underwriter [Member] Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Increase (decrease) in valuation allowance Warrant Liability Disclosure [Text Block] Warrant Liability Disclosure [Text Block] Warrant Liabilities Warrant [Member] Warrants Issued in 2009 to Purchase Common Stock [Member] Warrants and Rights Outstanding Fair value of estimated warrants Warrants Exercised Warrants Exercised Warrants exercised (in shares) Warrants To Purchase Stock [Member] Warrants To Purchase Common Stock [Member] Warrants to Purchase Stock [Member] Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average common shares outstanding used to calculate basic and diluted net loss per common share Working Capital Working Capital Positive (deficit) in working capital