Not available. [DocumentAndEntityInformationAbstract] Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Document Fiscal Year Focus Document Fiscal Period Focus Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding CONDENSED BALANCE SHEETS Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Series A Preferred Stock [Member] Series A Preferred Stock Series B Preferred Stock [Member] Series B Preferred Stock Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalents Debt Securities, Available-for-sale, Current Marketable securities Restricted Cash, Current Restricted cash Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, Preferred Stock and Stockholders’ Equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Deferred Rent Credit, Current Deferred rent, current portion Long-term Debt, Current Maturities Term loan, current portion Amount of deferred income from related party transactions excluding obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as current. Related Party Transactions, Deferred Revenue, Current Deferred revenue, current portion Liabilities, Current Total current liabilities Deferred Rent Credit, Noncurrent Deferred rent, net of current portion Long-term Debt, Excluding Current Maturities Term loan, net of current portion Amount of deferred income from related party transactions excluding obligation to transfer product and service to customer for which consideration has been received or is receivable, classified as noncurrent. Related Party Transactions, Deferred Revenue, Noncurrent Deferred revenue, net of current portion Liabilities Total liabilities Not available. Preferred Stock Abstract Redeemable preferred stock: Temporary Equity, Carrying Amount, Attributable to Parent Balance at the end Balance at the beginning Total redeemable preferred stock Stockholders' Equity Attributable to Parent [Abstract] Stockholders’ equity Preferred Stock, Value, Issued Preferred stock; par value of $0.001 per share, 10,000,000 shares authorized at June 30, 2020 and December 31, 2019. No shares issued and outstanding at June 30, 2020 and December 31, 2019 Common Stock, Value, Issued Common stock, par value of $0.001 per share; 100,000,000 shares authorized at June 30, 2020 and December 31, 2019, 27,520,650 and 27,499,260 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance at the end Balance at the beginning Total stockholders’ equity Liabilities and Equity Total liabilities, preferred stock and stockholders’ equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value per share Preferred Stock, Shares Authorized Preferred stock, number of shares authorized Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value per share Common stock, par value per share (in dollars per share) Common Stock, Shares Authorized Common stock, number of shares authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Common stock, shares outstanding CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenue from Contract with Customer [Abstract] Revenue: Revenue from Contract with Customer, Excluding Assessed Tax Revenue Revenue, Product and Service [Extensible List] Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Other Nonoperating Income (Expense) Other income, net Net Income (Loss) Attributable to Parent Net loss Net loss Earnings Per Share, Basic and Diluted [Abstract] Loss per share Earnings Per Share, Basic and Diluted Net loss per common share—basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Shares used in the calculation of loss per share Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average number of common shares —basic and diluted (in shares) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Comprehensive Loss: Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized gain on marketable securities Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss CONDENSED STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock [Member] Preferred Stock Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) Retained Earnings [Member] Accumulated Deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Deficit Temporary Equity, Shares Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock based compensation Stock Issued During Period, Value, New Issues Issuance of common stock Stock Issued During Period, Shares, New Issues Issuance of common stock (in shares) Equity impact of the value of new stock issued during the period. Stock Issued During Period Value Initial Public Offering Initial public offering, net of issuance costs of $9.4M Number of new stock issued during the period from initial public offering. Stock Issued During Period Shares Initial Public Offering Initial public offering, net of issuance costs of $9.4M (in shares) Stock Issued During Period, Value, Conversion of Units Conversion of preferred stock to common stock Stock Issued During Period, Shares, Conversion of Units Conversion of preferred stock to common stock (in shares) Adjusted amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Adjusted Unrealized (loss) gain on marketable securities, net of tax $0 Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Unrealized loss on marketable securities, tax Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Initial public offering issuance costs CONDENSED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Share-based Compensation Stock-based compensation Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Amount of increase (decrease) of consideration of unpaid rent that provides economic benefits in future periods. Increase Decrease In Deferred Rent Deferred rent Amount of increase (decrease) in deferred income from related party and obligation to transfer product and service to customer for which consideration has been received or is receivable. Increase (Decrease) in Deferred Revenue From Related Party Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Proceeds from Sale and Maturity of Marketable Securities Maturities of marketable securities Payments to Acquire Marketable Securities Purchase of marketable securities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance Initial Public Offering Proceeds from issuance of shares, net Proceeds from initial public offering, net of issuance costs Proceeds from Issuance of Common Stock Proceeds from issuances of common stock Proceeds from Issuance of Debt Proceeds from the term loan Repayments of Debt Payments of the term loan Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash—end of period Cash, cash equivalents and restricted cash—beginning of period Total Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for interest Noncash Investing and Financing Items [Abstract] Supplemental disclosures of noncash investing and financing activities: Capital Expenditures Incurred but Not yet Paid Purchase of property and equipment included in accrued liabilities Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Deferred financing costs included in accrued liabilities Represents the noncash conversion of convertible preferred stock into common stock. Noncash Or Part Noncash Conversion of Convertible Preferred Stock Into Common Stock Conversion of convertible preferred stock into common stock Nature of the Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Nature of the Business Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Restricted Cash. Cash and Cash Equivalents Disclosure [Text Block] Restricted Cash Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Marketable Securities Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements N/A Agreement with Eli Lilly and Company Collaborative Arrangement Disclosure [Text Block] Agreement with Eli Lilly and Company Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Income Taxes Income Tax Disclosure [Text Block] Income Taxes Subsequent Events Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation and Unaudited Financial Information Use of Estimates, Policy [Policy Text Block] Use of Estimates Disclosure of accounting policy pertaining to new accounting pronouncement that has been issued but not yet adopted. Description of New Accounting Pronouncements Not yet Adopted [Policy Text Block] Recently Issued Accounting Pronouncements Cash, Cash Equivalents and Investments [Table Text Block] Summary of reconciliation cash and cash equivalents and restricted cash per the balance sheet to the statement of cash flows Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of marketable securities Fair Value, by Balance Sheet Grouping [Table Text Block] Summary of fair value of the Company’s financial assets Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of stock option activity Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of stock based compensation expense recorded Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of assumptions used in the Black Scholes option pricing model for stock options granted Subsequent Event [Table] Sale of Stock [Axis] Sale Of Stock Name Of Transaction [Domain] Sale of Stock [Domain] I P O [Member] IPO Subsequent Event [Line Items] Nature of the Business Stockholders' Equity Note, Stock Split, Conversion Ratio Reverse stock split ratio Share Price Share price The cash outflow for payment of underwriting discounts and commissions. Payments Of Underwriting Discounts And Commissions Underwriting discounts and commissions Payments of Stock Issuance Costs Offering expenses Restricted Cash Debt Instrument, Face Amount Face amount Amount of required reserve of restricted cash. Required Reserve Restricted Cash Current Restricted cash required reserve Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] Reconciliation of cash and cash equivalents and restricted cash per the balance sheet to the statement of cash flows Represents restricted cash and other assets current. Restricted Cash And Other Assets Current Restricted cash (including $2,639 and $3,333 in other assets as of June 30, 2020 and December 31, 2019, respectively) Represents other assets non-current from restricted cash. Restricted Cash Other Assets Non Current Other assets, restricted cash Debt Securities, Available-for-sale [Table] Financial Instrument [Axis] Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Financial Instruments [Domain] U S Treasury Securities [Member] U.S. treasury securities U S Government Agencies Debt Securities [Member] Agency bonds Corporate Debt Securities [Member] Corporate bonds Debt Securities, Available-for-sale [Line Items] Investments Debt Securities, Available-for-sale, Amortized Cost Amortized Cost Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Gross Unrealized Loss Debt Securities, Available-for-sale Marketable securities Estimated Fair Value Marketable Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss Marketable securities other-than-temporarily impaired Available-for-sale Securities, Gross Realized Gains Gross realized gains Fair Value, by Balance Sheet Grouping [Table] Cash and Cash Equivalents [Axis] Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Domain] Money Market Funds [Member] Money market funds (cash equivalents) Measurement Basis [Axis] Portion At Fair Value Fair Value Disclosure [Member] Portion at Fair Value Measurement [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Fair Value Hierarchy and NAV [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain]