Entity Central Index Key Asset acquisition contingent consideration liability noncurrent. Disposal group including discontinued operation income (expenses). Disposal group including discontinued operation income (expenses) net. Income tax reconciliation change in fair value of warrants. Income tax reconciliation change in fair value of contingent consideration. Income tax rate reconciliation, gain (loss) on deconsolidation amount. Income tax rate reconciliation disallowance of loss on discontinued operations amount. Income tax reconciliation acquisition costs. Income tax reconciliation change in net operating loss. Income tax reconciliation change in temporary difference. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Minority interest investment in subsidiary. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class of Warrant or Right Class Of Warrant Or Right [Domain] Series A Warrants [Member] Series A Warrant Liability [Member] Series A Warrants [Member] Series C Warrants [Member] Series C Warrant [Member] Series C Warrants [Member] 2017 PIPE warrant liability. 2017 PIPE Warrant Liability [Member] Two Thousand Seventeen P I P E Warrant Liability [Member] 2018 PIPE warrant liability. 2018 PIPE Warrant Liability [Member] Two Thousand Eighteen P I P E Warrant Liability [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series B Convertible Preferred Stock [Member] Series B Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Restricted cash Restricted Cash And Cash Equivalents At Carrying Value Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Due from related party Due From Related Parties Current Minority interest investment in former subsidiary Minority Interest Investment In Subsidiary Current assets held for sale Assets Of Disposal Group Including Discontinued Operation Current Total current assets Assets Current Long-term assets Assets Noncurrent [Abstract] Property and equipment, net Property Plant And Equipment Net Other assets Other Assets Noncurrent Intangible assets, net Intangible Assets Net Excluding Goodwill Long-term assets held for sale Disposal Group Including Discontinued Operation Assets Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities And Stockholders Equity [Abstract] Current liabilities Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued compensation and other current liabilities Accrued Liabilities And Other Liabilities Current liabilities held for sale Liabilities Of Disposal Group Including Discontinued Operation Current Total current liabilities Liabilities Current Long-term liabilities Liabilities Noncurrent [Abstract] Warrant liability Derivative Liabilities Noncurrent Contingent liability for Essentialis purchase price Asset Acquisition Contingent Consideration Liability Noncurrent Other liabilities Other Liabilities Noncurrent Long-term liabilities held for sale Liabilities Of Disposal Group Including Discontinued Operation Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments And Contingencies Stockholders’ equity Stockholders Equity [Abstract] Preferred stock Preferred Stock Value Common stock Common Stock Value Additional paid-in-capital Additional Paid In Capital Common Stock Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Preferred stock par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred stock shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Preferred stock, aggregate liquidation preference Preferred Stock Liquidation Preference Value Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Asset acquisition contingent consideration change in fair value. Income Statement [Abstract] Operating expenses Operating Expenses [Abstract] Research and development Research And Development Expense Sales and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Change in fair value of contingent consideration Asset Acquisition Contingent Consideration Change In Fair Value Total operating expenses Operating Expenses Operating loss Operating Income Loss Other income (expense) Nonoperating Income Expense [Abstract] Cease-use income Gain Loss On Contract Termination Change in fair value of warrants liabilities Fair Value Adjustment Of Warrants Gain on deconsolidation of former subsidiary Deconsolidation Gain Or Loss Amount Interest and other expense, net Other Nonoperating Income Expense Total other income (expense) Nonoperating Income Expense Loss from continuing operations before provision for income tax benefit Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income tax benefit from continuing operations Income Tax Expense Benefit Loss from continuing operations Income Loss From Continuing Operations Loss from discontinued operations: Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity [Abstract] Operating loss Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax Other expense Disposal Group Including Discontinued Operation Income Expenses Total Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity Net loss Net Income Loss Loss per common share from continuing operations, basic and diluted Income Loss From Continuing Operations Per Basic And Diluted Share Loss per common share from discontinued operations, basic and diluted Discontinued Operation Income Loss From Discontinued Operation Net Of Tax Per Basic And Diluted Share Net loss per common share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average common shares outstanding used to calculate basic and diluted net loss per common share Weighted Average Number Of Share Outstanding Basic And Diluted Stock issued during period value reverse stock splits. Fair value at transaction date of warrants to purchase common stock value. Issuance of restricted common stock for bonuses share. Issuance of restricted common stock for bonuses value. Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Deficit [Member] Retained Earnings [Member] Asset purchase. Asset Purchase Asset Purchase [Axis] Asset purchase. Asset Purchase Asset Purchase [Domain] Essentialis, Inc. Essentialis, Inc. [Member] Essentialis Inc [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] 2017 Aspire purchase agreement. 2017 Aspire Purchase Agreement [Member] Two Thousand Seventeen Aspire Purchase Agreement [Member] Balances at beginning Balances at beginning (shares) Shares Outstanding Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase Decrease In Stockholders Equity Roll Forward Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Issuance of common stock on conversion of series B convertible preferred shares Stock Issued During Period Value Conversion Of Convertible Securities Issuance of common stock on conversion of series B convertible preferred shares (shares) Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of restricted common stock for bonuses Issuance Of Restricted Common Stock For Bonuses Value Issuance of restricted common stock for bonuses (shares) Issuance Of Restricted Common Stock For Bonuses Share Issuance of common stock to board members in lieu of cash payments for quarterly board fees Stock Issued During Period Value 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 Issued For Services Issuance of common stock to acquire Essentialis Stock Issued During Period Value Acquisitions Issuance of common stock to acquire Essentialis (Shares) Stock Issued During Period Shares Acquisitions Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock (shares) Stock Issued During Period Shares New Issues Issuance of shares to Aspire Capital in lieu of commitment fees Issuance Of Stock And Warrants For Services Or Claims Issuance of shares to Aspire Capital in lieu of commitment fees (Shares) Common Stock Capital Shares Reserved For Future Issuance Rounding adjustment resulting from 1 for 5 reverse split Stock Issued During Period Value Reverse Stock Splits Rounding adjustment resulting from 1 for 5 reverse split (Shares) Stock Issued During Period Shares Reverse Stock Splits Fair value at transaction date of warrants to purchase common stock Fair Value At Transaction Date Of Warrants To Purchase Common Stock Value Net loss Balances at ending Balances at end (shares) Less transaction costs Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Reverse stock split Stockholders Equity Note Stock Split Conversion Ratio1 Non-cash expense on shares issued. Proceeds from security deposit on sublease. Proceeds from sale of common stock and common stock warrants. Cash paid for the issuance of common stock and common stock warrants. Cash and cash equivalents period increase decrease included in current assets held for sale. Noncash or part noncash acquisition, contingent consideration. Accrued liability for cost of issuing common stock. Warrants issued in connection with sale of common stock. Statement Of Cash Flows [Abstract] Operating Activities Statement Operating Activities Segment [Axis] Operating Activities Segment Operating Activities [Domain] Continuing Operations [Member] Segment Continuing Operations [Member] Discontinued Operations Segment Discontinued Operations [Member] Cash flows from operating activities: Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Loss from discontinued operations Loss from continuing operations Adjustments to reconcile net loss from continuing operations to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation And Amortization Stock-based compensation expense Share Based Compensation Income tax benefit Increase Decrease In Income Taxes Board fees paid with common stock Other Noncash Expense Change in fair value of stock warrants Non-cash expense of issuing shares to Aspire Capital Noncash Expense On Shares Issued Gain on deconsolidation of former subsidiary Operating loss of minority interest investment Income Loss From Equity Method Investments Change in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses, other current assets and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Due from related party Increase Decrease In Due From Related Parties Accounts payable Increase Decrease In Accounts Payable Accrued compensation and other current liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Other long-term liabilities Increase Decrease In Other Noncurrent Liabilities Net cash used in continuing operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Net cash used in discontinued operating activities Cash Provided By Used In Operating Activities Discontinued Operations Net cash used in operating activities Net Cash Provided By Used In Operating Activities Cash flows from investing activities: Net Cash Provided By Used In Investing Activities [Abstract] Costs of Essentialis acquisition paid Payments To Acquire Assets Investing Activities Security deposit on sublease Proceeds From Security Deposit On Sublease Purchases of property and equipment Payments To Acquire Property Plant And Equipment Net cash used in continuing investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Net cash (used in) provided by discontinued investing activities Cash Provided By Used In Investing Activities Discontinued Operations Net cash (used in) provided by investing activities Net Cash Provided By Used In Investing Activities Cash flows from financing activities: Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Proceeds from sale of common stock and common stock warrants Proceeds From Sale Of Common Stock And Common Stock Warrants Cash paid for the issuance of common stock and common stock warrants Cash Paid For The Issuance Of Common Stock And Common Stock Warrants Net cash provided by continuing financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net cash provided by discontinued financing activities Cash Provided By Used In Financing Activities Discontinued Operations Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net increase in cash, cash equivalents and restricted cash from continuing operations Cash And Cash Equivalents Period Increase Decrease Net increase in cash, cash equivalents and restricted cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Net increase in cash and cash equivalents included in current assets held for sale Cash And Cash Equivalents Period Increase Decrease Included In Current Assets Held For Sale Cash, cash equivalents and restricted cash, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Cash, cash equivalents and restricted cash, end of period Supplemental disclosures of non-cash investing and financing information Noncash Investing And Financing Items [Abstract] Issuance of common stock in Essentialis acquisition Stock Issued1 Contingent consideration of Essentialis acquisition Noncash Or Part Noncash Acquisition Contingent Consideration Accrued liability for cost of issuing common stock Accrued Liability For Cost Of Issuing Common Stock Warrants issued in connection with sale of common stock Warrants Issued In Connection With Sale Of Common Stock Accounting Policies [Abstract] Overview Business Description And Basis Of Presentation [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Going Concern and Management's Plans Substantial Doubt About Going Concern [Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Fair Value Disclosures [Text Block]