Cover Abstract Statement [Table] Statement [Line Items] Document Type Document Quarterly Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Central Index Key Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag CONDENSED BALANCE SHEETS 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, Excluding Accrued Interest, 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 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 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 Liabilities Total liabilities 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 September 30, 2021 and December 31, 2020, no shares issued and outstanding at September 30, 2021 and December 31, 2020 Common Stock, Value, Issued Common stock, par value of $0.001 per share; 100,000,000 shares authorized at September 30, 2021 and December 31, 2020; 27,619,763 and 27,568,802 shares issued and outstanding at September 30, 2021 and December 31, 2020, respectively Additional Paid in Capital Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive (loss) income 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 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, 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 from former research and development arrangement 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 Net loss for basic and diluted Earnings Per Share, Basic and Diluted [Abstract] (Loss) earnings per share Earnings Per Share, Basic Basic EPS (in dollars per share) Basic (in dollars per share) Earnings Per Share, Diluted Diluted EPS (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Weighted average shares outstanding - basic and diluted Weighted Average Number of Shares Outstanding, Basic Weighted-average number of common shares outstanding (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted-average shares for diluted EPS (in shares) 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 (loss) on marketable securities Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Common Stock Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Accumulated Deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Deficit Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock based compensation Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Exercise of stock options (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 gain (loss) 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 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, amortization and other 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 investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Stock Options Exercised Proceeds from exercise of stock options Repayments of Debt Payments of the term loan Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) 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 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 Former Agreement with Eli Lilly and Company Collaborative Arrangement Disclosure [Text Block] Former Agreement with Eli Lilly and Company Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Net Loss Per Share Attributable to Common Stockholders Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies 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 Tabular disclosure of the maturities of available-for-sale securities from cost basis to fair value. Schedule Of Available For Sale Securities Maturities Table Text Block Schedule of available-for-sale maturities 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 Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Summary of computation of basic and diluted net loss per share attributable to common stockholders Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of shares excluded from the computation of diluted net loss per share 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 Proceeds from (Repayments of) Debt Repayment of principal debt balance Represents restricted cash and other assets current. Restricted Cash And Other Assets Current Restricted cash (including $0 and $1,806 in other assets as of September 30, 2021 and December 31, 2020, 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] Financial Instruments [Domain] Corporate bonds Commercial Paper Debt Securities, Available-for-sale [Line Items] Investments Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss 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, Excluding Accrued Interest Estimated Fair Value Marketable Securities Debt Securities, Available-for-sale, Realized Gain Gross realized gains Available-for-sale Securities, Debt Maturities [Abstract] Cost Maturities: Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost Within 1 year Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year to year two. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Available For Sale Securities Debt Maturities After One Through Two Years Amortized Cost Between 1 to 2 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Total investments available for sale Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Fair Value Maturities: Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Within 1 year Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in through second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Available For Sale Securities Debt Maturities After One Through Two Years Fair Value Between 1 to 2 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Total investments available for sale Fair Value, by Balance Sheet Grouping [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Money market funds (cash equivalents) Measurement Basis [Axis] Portion at Fair Value Measurement [Member] Fair Value Fair Value Hierarchy and NAV [Axis]