Entity Central Index Key Lessee operating lease liability payments due after year four and thereafter. Tenant improvement allowance receivable. Cover [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 Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Shell Company Entity Shell Company Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Security12b Title Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Bankruptcy Proceedings, Reporting Current Entity Bankruptcy Proceedings Reporting Current Grant liability current. Grant liability. Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Short-term investments Short Term Investments Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Current portion of unsecured related party note receivable Due From Related Parties Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Operating lease right-of-use asset Operating Lease Right Of Use Asset Long-term investments Long Term Investments Other long-term assets Other Assets Noncurrent Unsecured related party note receivable Due From Related Parties Noncurrent Total assets Assets Liabilities, convertible preferred stock and stockholders' equity (deficit) Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued liabilities Accrued Liabilities Current Current operating lease liability Operating Lease Liability Current Grant liability Grant Liability Current Total current liabilities Liabilities Current Operating lease liability, less current portion Operating Lease Liability Noncurrent Grant liability Grant Liability Derivative liability Derivative Liabilities Noncurrent Convertible notes, net Convertible Debt Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 8) Commitments And Contingencies Convertible preferred stock, $0.0001 par value; 0 and 2,797,464 shares authorized at September 30, 2020 and December 31, 2019, respectively; 0 and 2,617,386 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively Temporary Equity Carrying Amount Attributable To Parent Stockholders' equity (deficit): Stockholders Equity [Abstract] Common stock, $0.0001 par value; 900,000,000 and 10,088,017 shares authorized at September 30, 2020 and December 31, 2019, respectively; 31,087,395 and 3,641,449 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders' equity (deficit) Stockholders Equity Total liabilities, convertible preferred stock and stockholders' equity (deficit) Liabilities And Stockholders Equity Convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Convertible preferred stock, shares authorized Temporary Equity Shares Authorized Convertible preferred stock, shares issued Temporary Equity Shares Issued Convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Common stock, par value 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 Statement Of Income And Comprehensive Income [Abstract] Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Costs And Expenses Loss from operations Operating Income Loss Other income (expense), net Other Nonoperating Income Expense Net loss Net Income Loss Unrealized (loss)/gain on available-for-sale securities Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent Comprehensive loss attributable to common shareholders Comprehensive Income Net Of Tax Net loss per share attributable to common stockholders, basic and diluted Earnings Per Share Basic And Diluted Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Change in fair value of convertible preferred stock warrant liability. Change in fair value of grant liability. Amortization of available for sale securities. Increase decrease in operating lease liability. Proceeds from exercise of common stock options and common stock warrants. Proceeds from sales of convertible preferred stock and stock warrants, net of issuance costs. Deferred offering costs included in accounts payable and accrued liabilities. Issuance of common stock warrants in connection with series B convertible preferred stock financing. Recognition of warrant liability in connection with convertible preferred stock financing. Derivative liability recorded upon issuance of convertible notes. Statement Of Cash Flows [Abstract] Operating activities Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss 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] Stock-based compensation Share Based Compensation Change in fair value of derivative liability Derivative Gain Loss On Derivative Net Change in fair value of convertible preferred stock warrant liability Change In Fair Value Of Convertible Preferred Stock Warrant Liability Change in fair value of grant liability Change In Fair Value Of Grant Liability Accretion of discounts on convertible notes Accretion Expense Non-cash interest expense Paid In Kind Interest Gain on extinguishment of convertible notes Gains Losses On Extinguishment Of Debt Amortization of available-for-sale securities Amortization Of Available For Sale Securities Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable and accrued expenses Increase Decrease In Accounts Payable And Accrued Liabilities Operating lease liability Increase Decrease In Operating Lease Liability Net cash (used in) operating activities Net Cash Provided By Used In Operating Activities Investing activities Net Cash Provided By Used In Investing Activities [Abstract] Purchases of available-for-sale securities Payments To Acquire Available For Sale Securities Debt Maturities of available-for-sale securities Proceeds From Sale Of Available For Sale Securities Debt Purchases of property and equipment Payments To Acquire Property Plant And Equipment Principal payments received on stockholder note receivable Proceeds From Collection Of Loans Receivable Net cash (used in) provided by investing activities Net Cash Provided By Used In Investing Activities Financing activities Net Cash Provided By Used In Financing Activities [Abstract] Proceeds from exercise of common stock options and common stock warrants Proceeds From Exercise Of Common Stock Options And Common Stock Warrants Proceeds from initial public offering, net of issuance costs Proceeds From Issuance Initial Public Offering Proceeds from sales of convertible preferred stock and stock warrants, net of issuance costs Proceeds From Sales Of Convertible Preferred Stock And Stock Warrants Net Of Issuance Costs Proceeds from issuance of convertible notes, including derivative Proceeds From Convertible Debt Issuance costs of convertible notes Repayments Of Convertible Debt Proceeds from Paycheck Protection Program loan Proceeds From Short Term Debt Maturing In Three Months Or Less Repayment of Paycheck Protection Program loan Repayments Of Short Term Debt Maturing In Three Months Or Less Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Net increase (decrease) in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash and cash equivalents, beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash and cash equivalents, end of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Purchases of property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred But Not Yet Paid Deferred offering costs included in accounts payable and accrued liabilities Deferred Offering Costs Included In Accounts Payable And Accrued Liabilities Issuance of common stock warrants in connection with Series B convertible preferred stock financing Issuance Of Common Stock Warrants In Connection With Series B Convertible Preferred Stock Financing Issuance of Series B preferred stock upon conversion of promissory notes Stock Issued1 Recognition of warrant liability in connection with Series B convertible preferred stock financing Recognition Of Warrant Liability In Connection With Convertible Preferred Stock Financing Derivative liability recorded upon issuance of convertible notes Derivative Liability Recorded Upon Issuance Of Convertible Notes Conversion of convertible preferred stock upon closing of initial public offering Conversion Of Stock Amount Converted1 Right-of-use asset obtained in exchange for new operating lease liability Right Of Use Asset Obtained In Exchange For Operating Lease Liability Issuance of common stock value during the period initial public offering, net of underwriters' discounts and commissions. Issuance of common stock shares during the period initial public offering, net of underwriters' discounts and commissions. Temporary equity stock issued during period shares conversion of convertible preferred stock.. Temporary equity stock issued during period value conversion of convertible preferred stock. Stock issued during period shares conversion of convertible preferred stock. Stock issued during period value conversion of convertible preferred stock. Stock issued during period, value, warrants exercised. Stock issued during period, shares, warrants exercised. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Beginning balance Temporary equity, beginning balance, shares Temporary equity, beginning balance Beginning balance, shares Shares Outstanding Issuance of common stock upon exercise of common stock options Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of common stock options, shares Stock Issued During Period Shares Stock Options Exercised Issuance of Series B convertible preferred stock and common stock warrants, net of issuance costs of $3.5 million Stock And Warrants Issued During Period Value Preferred Stock And Warrants Temporary equity stock and warrants issued during period, shares, preferred stock and warrants. Temporary Equity, Issuance of Series B convertible preferred stock and common stock warrants, net, shares Temporary Equity Stock And Warrants Issued During Period Shares Preferred Stock And Warrants Temporary equity stock and warrants issued during period, value, preferred stock and warrants. Temporary Equity, Issuance of Series B convertible preferred stock and common stock warrants, net Temporary Equity Stock And Warrants Issued During Period Value Preferred Stock And Warrants Issuance of the Series B-1 convertible preferred stock upon conversion of convertible notes Stock Issued During Period Value Conversion Of Convertible Securities Temporary equity, stock issued during period, shares, conversion of convertible securities. Temporary Equity, Issuance of the Series B-1 convertible preferred stock upon conversion of convertible notes, shares Temporary Equity Stock Issued During Period Shares Conversion Of Convertible Securities Temporary equity, stock issued during period, value, conversion of convertible securities. Temporary Equity, Issuance of the Series B-1 convertible preferred stock upon conversion of convertible notes Temporary Equity Stock Issued During Period Value Conversion Of Convertible Securities Proceeds from initial public offering, net of underwriters' discounts and commissions and issuance costs Issuance Of Common Stock Value During The Period Initial Public Offering Net Of Underwriters Discounts And Commissions Proceeds from initial public offering, net of underwriters' discounts and commissions and issuance costs, Shares Issuance Of Common Stock Shares During The Period Initial Public Offering Net Of Underwriters Discounts And Commissions Conversion of convertible preferred stock Stock Issued During Period Value Conversion Of Convertible Preferred Stock Temporary equity, conversion of convertible preferred stock, shares Temporary Equity Stock Issued During Period Shares Conversion Of Convertible Preferred Stock Temporary equity, conversion of convertible preferred stock Temporary Equity Stock Issued During Period Value Conversion Of Convertible Preferred Stock Conversion of convertible preferred stock, shares Stock Issued During Period Shares Conversion Of Convertible Preferred Stock Exercise of common stock warrants Stock Issued During Period Value Warrants Exercised Exercise of common stock warrants, shares Stock Issued During Period Shares Warrants Exercised Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Other comprehensive income Other Comprehensive Income Loss Net Of Tax Net loss Ending balance Temporary equity, ending balance, shares Temporary equity, ending balance Ending balance, shares Adjustments to additional paid in capital stock of initial public offering costs. Issuance of Series B convertible preferred stock and common stock warrants, issuance costs Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Initial public offering, issuance cost Adjustments To Additional Paid In Capital Stock Of Initial Public Offering Costs Organization Consolidation And Presentation Of Financial Statements [Abstract] Description of Business Nature Of Operations Accounting Policies [Abstract] Significant Accounting Policies Significant Accounting Policies [Text Block] Fair Value Disclosures [Abstract] Fair Value Fair Value Disclosures [Text Block] Payables And Accruals [Abstract] Accrued Expenses Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Other Income And Expenses [Abstract] Other Income (Expense), Net Other Nonoperating Income And Expense [Text Block] Significant Agreements Collaborative Arrangement Disclosure [Text Block] Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Equity [Abstract] Convertible Preferred Stock Preferred Stock [Text Block] Common Stock Stockholders Equity Note Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock-based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Earnings Per Share [Abstract] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Unaudited interim condensed financial statements. Unaudited Interim Condensed Financial Statements Unaudited Interim Condensed Financial Statements Policy [Text Block] Fair Value Measurements Fair Value Measurement Policy Policy [Text Block] Convertible preferred stock warrant liability. Convertible Preferred Stock Warrant Liability Convertible Preferred Stock Warrant Liability Policy [Text Block] Short-term and Long-term Investments Investment Policy [Text Block] Use of Estimates Use Of Estimates Research and Development Expenses Research And Development Expense Policy Leases Lessee Leases Policy [Text Block] Stock-based Compensation Share Based Compensation Option And Incentive Plans Policy Net Loss Per Share Attributable to Common Stockholders Earnings Per Share Policy [Text Block] Segments Segment Reporting Policy Policy [Text Block] Emerging growth company status. Emerging Growth Company Status Emerging Growth Company Status Policy [Text Block] Recently Adopted Accounting Pronouncements Adopted and Not Yet Adopted New Accounting Pronouncements Policy Policy [Text Block] Liability Class Fair Value By Liability Class [Axis] Fair Value by Liability Class Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Grant liability. Grant Liability Grant Liability [Member] Derivative Liability Derivative Financial Instruments Liabilities [Member] Convertible preferred stock warrant liability. Convertible Preferred Stock Warrant Liability Convertible Preferred Stock Warrant Liability [Member] Schedule of Fair Value of Cash Equivalents, Short-term Investments and Long-term Investments Fair Value Assets Measured On Recurring Basis [Text Block] Schedule of Fair Value Liabilities, Activity Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Schedule of Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Schedule of Other Income (Expense), Net Schedule Of Other Nonoperating Income Expense Table [Text Block] Reconciliation of Undiscounted Operating Lease Cash Flows to Operating Lease Liability Payments Lessee Operating Lease Liability Maturity Table [Text Block] Schedule of Convertible Preferred Stock Schedule Of Stock By Class [Text Block] Schedule of reserved shares of common stock for future issuance. Schedule of Reserved Shares of Common Stock for Future Issuance Schedule Of Reserved Shares Of Common Stock For Future Issuance Table [Text Block] Stock-based Compensation Expense Recognized Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Weighted-Average Assumptions used in Estimating Fair Value of each Stock Options using Black-Scholes Option-Pricing Model Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Summary of Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Stock Options Outstanding and Exercisable Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Text Block] Summary of RSA Activity Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Summary of Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Description of business. Description of business. Description Of Business [Table] Description Of Business [Table] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] IPO I P O [Member] Common stock warrants member. Common Stock Warrants Common Stock Warrants [Member] Series B convertible preferred stock warrant. Series B Convertible Preferred Stock Warrant Series B Convertible Preferred Stock Warrant [Member] Convertible preferred stock, common stock warrants or Series B convertible preferred stock warrants. Convertible Preferred Stock, Common Stock Warrants Or Series B Convertible Preferred Stock Warrants Convertible Preferred Stock Common Stock Warrants Or Series B Convertible Preferred Stock Warrants [Member] Income Statement Location Income Statement Location [Axis] Statistical Measurement [Domain] Income Statement Location [Domain] Other Income (Expense), Net Other Operating Income Expense [Member] Description Of Business [Line Items] Description Of Business [Line Items] Reverse stock split, description Stockholders Equity Note Stock Split Reverse stock split conversion ratio Stockholders Equity Note Stock Split Conversion Ratio1 Number of shares issued and sold Stock Issued During Period Shares New Issues Public offering price per share Sale Of Stock Price Per Share Net proceeds from public offering Common shares issued upon exercise of warrants. Common shares issued on conversion of convertible preferred stock Stock Issued During Period Shares Conversion Of Convertible Securities Common shares issued upon exercise of warrants Common Shares Issued Upon Exercise Of Warrants Loss on final re-measurement of fair value of warrant liability Fair Value Adjustment Of Warrants Temporary equity shares outstanding Proceeds from issuance of convertible preferred stock and common stock warrants. Cash, cash equivalents and short-term and long-term investments. Net cash proceeds from issuance of convertible preferred stock, common stock warrants, and convertible notes Proceeds From Issuance Of Convertible Preferred Stock And Common Stock Warrants Cash, cash equivalents, and investments Cash Cash Equivalents And Short Term And Long Term Investments Basis of presentation and significant accounting policies. Basis of presentation and significant accounting policies. Basis Of Presentation And Significant Accounting Policies [Table] Basis Of Presentation And Significant Accounting Policies [Table] Accounting Standards Update Adjustments For New Accounting Pronouncements [Axis] Accounting Standards Update Type Of Adoption [Member] ASU 2016-02 Accounting Standards Update201602 [Member] ASU 2018-07 Accounting Standards Update201807 [Member] ASU 2018-13 Accounting Standards Update201813 [Member] Basis Of Presentation And Significant Accounting Policies [Line Items] Basis Of Presentation And Significant Accounting Policies [Line Items] Change in accounting principle, accounting standards update, adopted Change In Accounting Principle Accounting Standards Update Adopted Change in accounting principle, accounting standards update, adoption date Change In Accounting Principle Accounting Standards Update Adoption Date Number of operating segments Number Of Operating Segments Lease, practical expedient, use of hindsight Lease Practical Expedient Use Of Hindsight Operating lease right-of-use asset Operating lease liabilities Operating Lease Liability Change in accounting principle, accounting standards update, material impact Change In Accounting Principle Accounting Standards Update Immaterial Effect Cash and cash equivalents accumulated gross unrealized gain before tax. Cash and cash equivalents accumulated gross unrealized loss before tax. Fair Value By Balance Sheet Grouping [Table] Fair Value By Balance Sheet Grouping [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Recurring Basis Fair Value Measurements Recurring [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Cash Equivalents Cash Equivalents [Member] Asset Class Fair Value By Asset Class [Axis] Asset Class Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation By Asset Class [Domain] Money Market Fund Money Market Funds [Member] Commercial Paper Commercial Paper [Member] Commercial Paper Commercial Paper Not Included With Cash And Cash Equivalents [Member] U.S. Government Debt and Agency Securities U S Government Agencies Debt Securities [Member] U.S. Treasury Bills U S Treasury Securities [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Short-term Investments Short Term Investments [Member] Corporate Bonds Corporate Bond Securities [Member] Long-term Investments. Long-term Investments Long Term Investments [Member] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] Cash equivalents, Amortized Cost Cash equivalents, Unrealized Gains Cash And Cash Equivalents Accumulated Gross Unrealized Gain Before Tax Cash equivalents, Unrealized Losses Cash And Cash Equivalents Accumulated Gross Unrealized Loss Before Tax Cash equivalents, Fair Value Cash And Cash Equivalents Fair Value Disclosure Investments, Amortized Cost Available For Sale Debt Securities Amortized Cost Basis Investments, Unrealized Gains Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Investments, Unrealized Losses Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Investments, Fair Value Available For Sale Securities Debt Securities Current Investments, Fair Value Available For Sale Securities Debt Securities Noncurrent Additional grant liability Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Gain Loss Included In Earnings Total grant liability Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value 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 [Line Items] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Fair value at beginning of period Change in fair value of liability Fair value at end of period Derivative liability recorded upon issuance of convertible notes Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Issues Settlement Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Settlements Recognition of convertible preferred stock warrant liability Settlement Accrued research and development expenses, current. Accrued professional services and other, current. Research and development expenses Accrued Research And Development Expenses Current Employee compensation and benefits Employee Related Liabilities Current Professional services and other Accrued Professional Services And Other Current Total accrued expenses Research grant income nonoperating. Change in fair value of derivative liability. Part the Cloud research grant Research Grant Income Nonoperating Interest and other income Interest And Other Income Interest expense Interest Expense Change in fair value of derivative liability Change In Fair Value Of Derivative Liability Change in fair value of grant liability Change in convertible preferred stock warrant liability Gain on extinguishment of convertible notes Total other income (expense), net Nonoperating Income Expense Milestone payments amount payable upon trial initiation. Milestone payments amount payable upon marketing approval. Payment on achievement of development milestone. Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Arrangements And Nonarrangement Transactions [Member] Washington state university license agreement. Washington State University License Agreement Washington State University License Agreement [Member] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others By Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others Type [Domain] Phase two clinical trail initiation of license agreement. Phase 2 Clinical Trial Initiation Phase Two Clinical Trail Initiation Of License Agreement [Member] Phase three clinical trail initiation of license agreement. Phase 3 Clinical Trial Initiation Phase Three Clinical Trail Initiation Of License Agreement [Member] Washington life services discovery fund grant agreement. Washington Life Services Discovery Fund Grant Agreement Washington Life Services Discovery Fund Grant Agreement [Member] Other Income (Expense), Net Nonoperating Income Expense [Member] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] Milestone payments on development milestone achieved Payment On Achievement Of Development Milestone Milestone payments, amount payable Milestone Payments Amount Payable Upon Trial Initiation Milestone payments payable upon marketing approval Milestone Payments Amount Payable Upon Marketing Approval Annual minimum royalty payments after first commercial sale. Net sales exempt from royalty payment. Royalty obligation. Annual minimum royalty payments Annual Minimum Royalty Payments After First Commercial Sale Net sales exempt from royalty payment Net Sales Exempt From Royalty Payment Royalty obligation Royalty Obligation Grants received. Grant liability maximum amount payable under agreement. Grant received Grants Received Grant liability payable amount, maximum Grant Liability Maximum Amount Payable Under Agreement Estimated fair value of grant liability. Estimated fair value of the grant liability Estimated Fair Value Of Grant Liability Debt instrument, maturity month and year. Debt Instrument [Table] Debt Instrument [Table] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Unsecured convertible notes. Unsecured Convertible Notes Unsecured Convertible Notes [Member] Series B-1 convertible preferred stock. Series B-1 Convertible Preferred Stock Series B1 Convertible Preferred Stock [Member] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Paycheck protection program CARES act. Paycheck Protection Program Paycheck Protection Program C A R E S Act [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Maximum Maximum [Member] Minimum [Member] Minimum [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, principal amount Debt Instrument Face Amount Debt instrument, interest rate Debt Instrument Interest Rate Stated Percentage Debt instrument, maturity month and year Debt Instrument Maturity Month And Year Debt instrument, payment terms Debt Instrument Payment Terms Debt instrument, conversion price, percentage Debt Instrument Convertible Threshold Percentage Of Stock Price Trigger Debt instrument, repurchase price, percentage Debt Instrument Redemption Price Percentage Debt conversion, converted instrument, amount Debt Conversion Converted Instrument Amount1 Debt instrument, accrued interest Interest Payable Current And Noncurrent Debt conversion, converted instrument, shares issued Debt Conversion Converted Instrument Shares Issued1 Gain on extinguishment of debt Loan amount received Proceeds From Issuance Of Long Term Debt Loan repayment term Debt Instrument Term Operating lease expiration month and year. Lessee Lease Description [Table] Lessee Lease Description [Table] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Laboratory and office facilities. Laboratory and Office Facilities Laboratory And Office Facilities [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Bothell, Washington. Bothell, Washington Bothell Washington [Member] University of Washington Seattle. University of Washington, Seattle University Of Washington Seattle [Member] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Operating lease expiration month and year Operating Lease Expiration Month And Year Operating lease initial term Lessee Operating Lease Term Of Contract Operating lease existence of option to extend Lessee Operating Lease Existence Of Option To Extend Operating lease, additional term of contract Lessee Operating Lease Renewal Term Operating lease, remaining lease term Lessee Operating Lease Remaining Lease Term Incremental borrowing rate Lessee Operating Lease Discount Rate Remaining 2020 Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 2021 Lessee Operating Lease Liability Payments Due Next Twelve Months 2022 Lessee Operating Lease Liability Payments Due Year Two 2023 Lessee Operating Lease Liability Payments Due Year Three 2024 Lessee Operating Lease Liability Payments Due Year Four 2025 and thereafter Lessee Operating Lease Liability Payments Due After Year Four And Thereafter Total undiscounted lease payments Lessee Operating Lease Liability Payments Due Present value adjustment for minimum lease commitments Lessee Operating Lease Liability Undiscounted Excess Amount Tenant improvement allowance receivable Tenant Improvement Allowance Receivable Net lease liability Operating lease expense Operating Lease Expense Variable lease expense Variable Lease Cost Short term leases, rent expense Short Term Lease Cost Cash paid for amounts included in measurement of lease liability Operating Lease Payments Class Of Stock Disclosures [Abstract] Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Series A convertible preferred stock. Series A Convertible Preferred Stock Series A Convertible Preferred Stock [Member] Series A-1 convertible preferred stock. Series A-1 Convertible Preferred Stock Series A1 Convertible Preferred Stock [Member] Class Of Stock [Line Items] Class Of Stock [Line Items] Convertible Preferred Stock, Shares Authorized Convertible Preferred Stock, Shares Issued Convertible Preferred Stock, Shares Outstanding Convertible Preferred Stock, Carrying Value Convertible Preferred Stock, Aggregate Liquidation Preference Preferred Stock Liquidation Preference Value Class of warrant or right exercised. Convertible preferred stock conversion price. Convertible preferred stock conversion price percentage. Series B convertible preferred stock. Series B Convertible Preferred Stock Series B Convertible Preferred Stock [Member] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class of Warrant or Right Class Of Warrant Or Right [Domain] Class of warrant or right, purchase price one. Purchase Price $1.15 Per Share Class Of Warrant Or Right Purchase Price One [Member] Shares issued Purchase price per share Share Price Proceeds from issuance of convertible preferred stock Proceeds From Issuance Of Convertible Preferred Stock Warrants to purchase preferred stock Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights Warrants to purchase preferred stock exercised Class Of Warrant Or Right Exercised Convertible preferred stock issuance for net proceeds Proceeds From Issuance Of Warrants Class of warrant or right, exercise price Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Convertible preferred stock terms of conversion Convertible Preferred Stock Terms Of Conversion Convertible preferred stock shares issued upon conversion Convertible Preferred Stock Shares Issued Upon Conversion Convertible preferred stock conversion price Convertible Preferred Stock Conversion Price Convertible preferred stock conversion price percentage Convertible Preferred Stock Conversion Price Percentage Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock options outstanding. Stock Options Outstanding Stock Options Outstanding [Member] Shares available for future grant under the 2020 equity incentive plan. Shares available for Future Grant under 2020 Equity Incentive Plan Shares Available For Future Grant Under Two Thousand Twenty Equity Incentive Plan [Member] Shares available for future grant under the employee stock purchase plan. Shares available for Future Grant under Employee Stock Purchase Plan Shares Available For Future Grant Under Employee Stock Purchase Plan [Member] Reserved shares of common stock for future issuance Common Stock Capital Shares Reserved For Future Issuance 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] Research and Development Research And Development Expense [Member] General and Administrative General And Administrative Expense [Member] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Stock-based compensation expense Allocated Share Based Compensation Expense Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Title of Individual Title Of Individual [Axis] Title of Individual Title Of Individual With Relationship To Entity [Domain] Employees and directors. Employees and Directors Employees And Directors [Member] Advisors. Advisors Advisors [Member] Non-employees. Non-employees Non Employees [Member] Restricted Stock Award (RSA) Restricted Stock [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Expected dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Risk-free interest rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Expected volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Expected term (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Share-based compensation arrangement by share based payment award options, weighted average grant date fair value of options granted. Weighted-average grant-date fair value of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Weighted Average Grant Date Fair Value Of Options Granted Share-based compensation arrangement by share-based payment award, options, available for grant, authorized. Share-based compensation arrangement by share-based payment award, options, available for grant, granted. Share-based compensation arrangement by share-based payment award, options, available for grant, exercised. Share-based compensation arrangement by share-based payment award, options, available for grant, forfeited and expired. Available for Grant, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Available for Grant, Authorized Share Based Compensation Arrangement By Share Based Payment Award Options Available For Grant Authorized Available for Grant, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Available For Grant Granted Available for Grant, Exercised Share Based Compensation Arrangement By Share Based Payment Award Options Available For Grant Exercised Available for Grant, Forfeited/expired Share Based Compensation Arrangement By Share Based Payment Award Options Available For Grant Forfeited And Expired Available for Grant, Ending Balance Shares, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Shares, Exercised Shares, Forfeited/expired Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Shares, Ending Balance Shares, Expected to vest Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Shares, Options exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted-Average Exercise price per Share, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted-Average Exercise price per Share, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted-Average Exercise price per Share, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted-Average Exercise price per Share, Forfeited/expired Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price Weighted-Average Exercise price per Share, Ending Balance Weighted-Average Exercise price per Share, Expected to vest Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price Weighted-Average Exercise price per Share, Options exercisable Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-Average Remaining Contractual Term (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Weighted-Average Remaining Contractual Term, Expected to vest (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 Weighted-Average Remaining Contractual Term, Options exercisable (in years) Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Aggregate Intrinsic Value, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Expected to vest Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value Aggregate Intrinsic Value, Options exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Fair value of options vested Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 Aggregate intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Remaining weighted-average period expected to recognize unrecognized compensation cost Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Share based compensation shares authorized under stock option plans exercise price. Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table] Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table] Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Axis] Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Domain] Exercise price one. Exercise Price $0.16 Exercise Price One [Member] Exercise price two. Exercise Price $0.48 Exercise Price Two [Member] Exercise price three. Exercise Price $1.00 Exercise Price Three [Member] Exercise price four. Exercise Price $1.04 Exercise Price Four [Member] Exercise price five. Exercise Price $1.19 Exercise Price Five [Member] Exercise price six. Exercise Price $1.31 Exercise Price Six [Member] Exercise price seven. Exercise Price $1.35 Exercise Price Seven [Member] Exercise price eight. Exercise Price $1.49 Exercise Price Eight [Member] Exercise price nine. Exercise Price $17.00 Exercise Price Nine [Member] Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] Exercise Price ($) Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Shares Outstanding Shares Exercisable Share-based compensation arrangement by share-based payment award, subject to repurchase upon discontinued service. Vesting period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Number of shares subject to repurchase upon discontinued service Share Based Compensation Arrangement By Share Based Payment Award Subject To Repurchase Upon Discontinued Service Share Equivalent, Non-vested, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Share Equivalent, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Share Equivalent, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Share Equivalent, Non-vested, Ending Balance Weighted-Average Grant Date Fair Value, Non-vested, Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Non-vested, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Non-vested, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Non-vested, Ending Balance Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Convertible preferred stock on an as-converted basis. Convertible Preferred Stock on An as-converted Basis Convertible Preferred Stock On Converted Basis [Member] Unvested restricted stock awards. Unvested RSAs Unvested Restricted Stock Awards [Member] Stock options to purchase common stock. Stock Options to Purchase Common Stock Stock Options To Purchase Common Stock [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Outstanding shares of potentially dilutive securities were excluded from the computation of the diluted net loss per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Underwriters’ Option Over Allotment Option [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of additional shares sold Initial public offering price per share