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Estimated useful life Finite-Lived Intangible Asset, Useful Life Employee-related Liabilities, Current, Total Accrued compensation Employee-related Liabilities, Current Proceeds from offering after deducting underwriting discount and other estimated offering expenses Proceeds From Offering After Deducting Underwriting Discount And Other Estimated Offering Expenses Proceeds from offering after deducting underwriting discount and other estimated offering expenses. Accrued clinical trial site costs Increase Decrease In Accrued Clinical Trial Site Costs Increase decrease in accrued clinical trial site costs. 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Common stock warrant liability [Member] Common stock warrant liability [Member] Common Stock Warrant Liability [Member] Common Stock Warrant Liability [Member] Expiration of warrants, in shares Expiration Of Warrants Expiration of warrants. Components of Deferred Tax Assets [Abstract] Provision for income tax benefit Income Tax Expense (Benefit) Essentialis, Inc. [Member] Essentialis Inc [Member] Essentialis, Inc. 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Common Stock Maximum Aggregate Purchase Price Common stock, maximum aggregate purchase price Options exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fixed assets Deferred Tax Assets, Property, Plant and Equipment Issuance of restricted stock units and option exercises under equity incentive plan Issuance Of Restricted Stock Units Value And Option Exercises Under Equity Incentive Plan Issuance of restricted stock units value and option exercises under equity incentive plan. 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Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Leases Lessee, Leases [Policy Text Block] Tax Credit Carryforward Tax Credit Carryforward [Axis] 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] Other Financial Statement Details Disclosure [Abstract] Other financial statement details disclosure. Debt Instrument Debt Instrument [Axis] Stockholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Counterparty Name [Axis] Entity Address, Address Line Two Entity Address, Address Line Two Restricted stock units cancelled/forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Award Type Award Type [Axis] Warrants exercised Class Of Warrants Exercised Class of warrants exercised. Public Offering [Member] Public Offering [Member] Public Offering Issuance of restricted stock units under equity incentive plan, net of tax withholdings (shares) Issuance Of Restricted Stock Units Shares Under Equity Incentive Plan Net Of Tax Withholdings Issuance of restricted stock units shares under equity incentive plan, net of tax withholdings. Gross non-current deferred tax assets Deferred Tax Assets, Gross Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Other Nonoperating Income (Expense), Total Interest income Other Nonoperating Income (Expense) Other income Nonoperating Income (Expense) [Abstract] Research and Development Expense, Total Research and development Research and Development Expense Total lease payments Lessee, Operating Lease, Liability, to be Paid Decrease related to prior year tax positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Entity Central Index Key Entity Central Index Key Increase (decrease) in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Change in value of contingent liability due to assignment of rights to Soleno Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Change In Liability Due To Assignment Of Rights Fair value measurement with unobservable inputs reconciliation recurring basis change in liability due to assignment of rights. Accounting Policies [Abstract] Change in net operating loss true up Income Tax Reconciliation Change In Net Operating Loss Income tax reconciliation change in net operating loss. Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Table] Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Finance lease, discount rate Finance Lease, Weighted Average Discount Rate, Percent Measurement Frequency Measurement Frequency [Axis] Maximum potential cash earnout payments Asset Acquisition Contingent Consideration Arrangements Earn Out Payment Asset acquisition contingent consideration arrangements earn out payment, Number of shares available for grant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Options vested and expected to vest at end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Increase (Decrease) in Employee Related Liabilities, Total Accrued compensation Increase (Decrease) in Employee Related Liabilities General and Administrative Expense, Total General and administrative General and Administrative Expense Measurement Input Type Measurement Input Type [Domain] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Principal paid on finance lease liabilities Financing cash flows from finance leases Finance Lease, Principal Payments Research and Development [Member] Research and Development Expense [Member] Measurement input Warrants and Rights Outstanding, Measurement Input Right-of use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Accumulated Deficit [Member] Retained Earnings [Member] Tax Credit Carryforward, Name Tax Credit Carryforward, Name [Domain] Measurement Input Type Measurement Input Type [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Schedule Of Supplemental Cash Flow Information Related To Leases Schedule Of Supplemental Cash Flow Information Related To Leases Table [Text Block] Schedule of supplemental cash flow information related to leases. Public offering price per pre-funded warrant Public Offering Price Per Pre Funded Warrant Public offering price per pre-funded warrant. Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property and equipment, gross Property, Plant and Equipment, Gross Vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Entity Interactive Data Current Entity Interactive Data Current Tax credit carryforwards Tax Credit Carryforward, Amount Entity Public Float Entity Public Float Payment to acquire office furniture under operating lease Payments to Acquire Furniture and Fixtures 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, Number Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Net intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 2023 Lessee, Operating Lease, Liability, to be Paid, Year One Less transaction costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Net proceeds from issuance of public offering Proceeds from Issuance Initial Public Offering Local Phone Number Local Phone Number Beginning balance Ending balance Unrecognized Tax Benefits Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Number of commercial banks Concentration Risk Credit Risk Numberof Banks Concentration Risk, Credit Risk, Number of Banks Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Operating lease liabilities Increase Decrease In Operating Lease Liabilities Increase decrease in operating lease liabilities. Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease, description Lessee, Operating Lease, Description Options granted Number of options granted Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Warrant liability Derivative Liability, Noncurrent 2010 and 2012 Convertible Promissory Notes [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] Summary of Changes in Fair Value of Level 3 Financial Instruments Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Reverse stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Income Statement Location Income Statement Location [Domain] Risk-free Rate [Member] Measurement Input, Risk Free Interest Rate [Member] Change in capital losses Income Tax Reconciliation Change In Capital Losses Income tax reconciliation change in capital losses. Beginning balance Ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Balances at beginning (shares) Balances at end (shares) Shares, Outstanding Prepaid expenses, other current assets and other assets Increase (Decrease) in Prepaid Expense and Other Assets Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Other deferred tax assets Deferred Tax Assets, Tax Credit Carryforwards, Other Text Block [Abstract] Amortization, Total Amortization Amortization Exercisable warrants maximum aggregate exercise price ExercisableWarrants Maximum Aggregate Exercise price Exercisable warrants maximum aggregate exercise price. Beginning balance Ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Warrants to Purchase Stock [Member] Warrants To Purchase Common Stock [Member] Warrants To Purchase Stock [Member] Debt Instrument, Name Debt Instrument, Name [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Intangible Assets, Net (Excluding Goodwill), Total Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Schedule Of Significant Accounting Policies [Line Items] Schedule Of Significant Accounting Policies [Line Items] Schedule Of Significant Accounting Policies [Line Items] Summary of Financial Instruments Measured at Fair Value on Recurring Basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Class of Warrant or Right Class of Warrant or Right [Axis] Vesting [Domain] Net loss per common share basic Earnings Per Share, Basic Earnings Per Share, Basic, Total Assets Assets [Abstract] Income Tax Contingency [Table] Income Tax Contingency [Table] Net deferred tax assets Deferred Tax Assets, Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Price per unit Shares Issued, Price Per Share Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount, Total Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Percentage of probability of achieving milestone Percentage Of Probability Of Achieving Milestone Percentage of the probability of achieving the milestone. Stockholders' Equity (Deficit) Shareholders' Equity and Share-Based Payments [Text Block] 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] Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Warrants Issued to Underwriter to Purchase Common Stock [Member] Underwriter [Member] Underwriter [Member] Underwriter [Member] Property and Equipment, Net Property, Plant and Equipment, Policy [Policy Text Block] Antidilutive Securities, Name Antidilutive Securities, Name [Domain] Income Tax Authority Income Tax Authority [Axis] Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Total operating lease cost Operating Lease Cost And Sublease Income Operating lease cost and sublease income. Current assets Assets, Current [Abstract] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Four 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Two Exercise price of warrants (in dollars per share) Exercise price of warrants exercised Class of Warrant or Right, Exercise Price of Warrants or Rights Significant Components of Company's Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] 2014 Plan and Inducement Plan [Member] Two Thousand And Fourteen Equity Incentive Plan And Two Thousand Twenty Inducement Equity Incentive Plan [Member] Two thousand and fourteen equity incentive plan and two thousand twenty inducement equity incentive plan. Measurement Frequency Measurement Frequency [Domain] Intangible Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Change in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Warrants and rights exercisable term from following receipt of U.S. Food and drug administration approval Warrants And Rights Exercisable Term From Following Receipt of U.S. Food and Drug Administration Approval Warrants and rights exercisable term from following receipt of U.S. Food and drug administration approval. United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Cover [Abstract] Product and Service [Domain] Reverse Stock Split Reverse Stock Split Policy [Policy Text Block] Reverse stock split. Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Restricted stock units vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Current liabilities Liabilities, Current [Abstract] Maximum [Member] Maximum [Member] Measurement term Warrants and Rights Outstanding, Term Warrants term Class Of Warrant Or Right Warrant Term Class Of Warrant Or Right, Warrant Term Summary of Stock Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] 2018 PIPE Warrant Liability [Member] Two Thousand Eighteen P I P E Warrant Liability To Purchase Common Stock [Member] Two thousand eighteen PIPE warrant liability to purchase common stock. 2027 and thereafter Finite Lived Intangible Assets Amortization Expense After Year Four Finite lived intangible assets amortization expense after year four. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Furniture and Fixtures [Member] Furniture and Fixtures [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Deferred Tax Liabilities, Gross, Total Total non-current deferred tax liabilities Deferred Tax Liabilities, Gross ISOs [Member] Incentive Stock Options [Member] Incentive Stock Options [Member] Segments Segment Reporting, Policy [Policy Text Block] Research and development costs, amortization period Deferred Tax Assets Capitalized Research And Development Expenses Amortization Period Deferred tax assets capitalized research and development expenses amortization period. Options exercisable at end of period Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Estimated useful lives of property and equipment Property, Plant and Equipment, Useful Life Matching contribution by Company Defined Contribution Plan, Cost Foreign Tax Authority [Member] Foreign Tax Authority [Member] Derivative Financial Instruments, Liabilities Derivative Financial Instruments, Liabilities [Member] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Three Common stock, shares authorized Common Stock, Shares Authorized Warrants Warrant Liability Disclosure [Text Block] Warrant Liability Disclosure [Text Block] Trading Symbol Trading Symbol Performance-Based Options [Member] Performance Shares [Member] Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Accounts payable,net Accounts Payable, Current, Total Accounts Payable, Current Plan Name Plan Name [Axis] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Tax (benefit) on the loss before income tax expense computed at the federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Change in state rates Income Tax Reconciliation Change In State Rates Income tax reconciliation change in state rates. Change in fair value of contingent consideration Asset Acquisition Contingent Consideration Change In Fair Value Asset acquisition contingent consideration change in fair value. Variable lease cost Variable Lease, Cost Restricted stock units granted Stock units granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Options granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Antidilutive securities excluded from computations of diluted weighted-average shares outstanding Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Supplemental disclosure of non-cash investing and financing information Noncash Investing and Financing Items [Abstract]