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Statistical Measurement Statistical Measurement [Domain] Common stock exercise price Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise price of warrants per share of common stock Total current assets Assets, Current Stock-based compensation expense Share-Based Payment Arrangement, Expense Document Period End Date Document Period End Date Title of Individual Title and Position [Axis] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Total cost related to the 401(k) plan Defined Contribution Plan, Cost Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Other Other Assets, Miscellaneous, Noncurrent Statement of Financial Position [Abstract] Restricted Stock Unit Awards Restricted Stock Units Restricted Stock Units (RSUs) On First Date of Offering On First Date Of Offering [Member] On first date of offering. 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Stock Options Outstanding [Member] Stock Options Outstanding Entity File Number Securities Act File Number Cover [Abstract] Total prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Forfeited/Cancelled Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Shares reserved for issuance increase percentage of total number of shares of common stock outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum Investments [Domain] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Research and development - related party Research and Development for Related Party Research and development for related party. 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Warrants [Policy Text Block] Pre-Funded Warrants Volatility Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Preferred stock authorized, shares Preferred Stock, Shares Authorized Weighted average shares and pre-funded warrants outstanding, diluted Weighted Average Number of Shares And Pre-Funded Warrants Outstanding, Diluted Weighted average number of shares and pre-funded warrants outstanding, diluted. Entity Registrant Name Entity Registrant Name Proceeds from redemptions of short-term investments Proceeds from Sale of Short-Term Investments Other Nonoperating Income (Expense), Total Other Nonoperating Income (Expense) Other income, net Subsequent Events [Abstract] Income Tax Expense (Benefit) Income tax expense Measurement Frequency [Axis] Gross proceeds from issuance of common stock Proceeds from Issuance of Common Stock Proceeds from issuance of common stock upon exercise of underwriters' option Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share Based Compensation Arrangement by Share Based Payment Award [Line Items] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss) income Purchase of property and equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Stock awards granted Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Employee Stock Purchase Plan. Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Total assets Assets Property, Plant and Equipment [Table] Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Income Statement [Abstract] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Sale of Stock, Number of Shares Issued in Transaction Shares of common stock sold Sale of stock, shares issued Common stock issued, shares Stock Issued During Period, Shares, New Issues Issuance of common stock through public equity offering, net of offering costs of $595, shares Net loss per share - diluted Earnings Per Share, Diluted, Total Class of warrant or right notice period. Class Of Warrant Or Right Notice Period Warrant notice limit Title of Individual Title and Position [Domain] City Area Code City Area Code Board of directors two. Board Of Director Board Of Director [Member] Issuance of common stock under ESPP Stock Issued During Period, Value, Employee Stock Purchase Plan Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Property, Plant and Equipment, Net Property and equipment, net Total property and equipment, net Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of common stock upon vesting of restricted stock units, net of taxes paid Loss from operations Operating Income (Loss) Accumulated Deficit Retained Earnings [Member] Cash and Cash Equivalents [Axis] Public Offering Including Underwriters Option Public Offering Including Underwriters Option [Member] Public offering including underwriters option. Share-Based Payment Arrangement, Noncash Expense, Total Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Offering costs Payments of Stock Issuance Costs Payment of deferred financing costs Underwriting discounts and commissions Level 1 Fair Value, Inputs, Level 1 [Member] Class Of Stock [Line Items] Class of Stock [Line Items] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by (used in) financing activities Change in Accounting Principle, Accounting Standards Update, Adopted [true false] Accounting Standards, Adoption Loss Contingency, Name of Plaintiff Name of plaintiff Schedule of Common Stock Equivalents Excluded from Diluted Net Loss Calculation Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Debt Securities, Available-for-Sale [Table] Entity Interactive Data Current Entity Interactive Data Current Income Statement Location Statement of Income Location, Balance [Domain] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Furniture and Fixtures [Member] Furniture and Fixtures Accretion of debt discount on available-for-sale securities Accretion (Amortization) of Discounts and Premiums, Investments Entity Tax Identification Number Entity Tax Identification Number Organization and Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Local Phone Number Local Phone Number Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Payments of Financing Costs Payments of Financing Costs, Total Payment of issuance costs associated with financings Accounting Policies [Abstract] Class of Stock [Domain] Class of Stock Shares available for issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Weighted-average period over which unrecognized compensation expense is expected to be recognized Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Accrued legal and professional fees Accrued Professional Fees, Current Cash, Cash Equivalents, and Short-Term Investments Cash, Cash Equivalents, and Short-Term Investments, Total Cash, cash equivalents and short-term investments Schedule Of Stock By Class [Table] Stock, Class of Stock [Table] Entity Emerging Growth Company Entity Emerging Growth Company Vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term