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respectively Common Stock, Value, Issued Supplier [Domain] Supplier [Domain] Total Long-term Debt, Including Undiscounted Interest Long-term Debt, Including Undiscounted Interest Research and development expenses Research and Development Expense 2020 (remaining) Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year Other Financial Information [Abstract] Other Financial Information Counterparty Name [Domain] Counterparty Name [Domain] Anthem Blue Cross Blue Shield Anthem Blue Cross Blue Shield [Member] Anthem Blue Cross Blue Shield Expected volatility rate, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Reorganizations [Abstract] Stock Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Equity Components [Axis] Equity Components [Axis] Total stockholders' equity Beginning balance Ending balance Stockholders' Equity Attributable to Parent Concentration Risk Type [Domain] Concentration Risk Type [Domain] Supplemental disclosure of non-cash items: Supplemental Cash Flow Elements [Abstract] Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock Temporary Equity, Accretion of Dividends Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Licensing Agreements License Agreement Terms [Member] Non-cash interest expense Paid-in-Kind Interest Common stock Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Series G redeemable convertible preferred stock Series G Preferred Stock [Member] Depreciation and amortization Depreciation, Depletion and Amortization Conversion of preferred stock to common stock in connection with initial public offering Stock Issued During Period, Value, Conversion of Convertible Securities Warrant expiration April 1, 2026 Expiration Apr 1, 2026 [Member] Expiration Apr 1, 2026 Cash paid for interest expense Interest Paid, Excluding Capitalized Interest, Operating Activities Forecast Forecast [Member] Preferred stock, $0.001 par value; 10,000,000 shares authorized, no shares issued or outstanding at September 30, 2020 and December 31, 2019 Preferred Stock, Value, Issued Beginning balance (in shares) Ending balance (in shares) Redeemable convertible preferred stock outstanding (in shares) Temporary Equity, Shares Outstanding Money market funds Cash and Cash Equivalents, Fair Value Disclosure Term loan, fee incurred upon payment of final installment Debt Instrument, Fee Amount Security Exchange Name Security Exchange Name Deemed dividend recorded in connection with financing transactions Other Preferred Stock Dividends and Adjustments Accrued payroll and related expenses Accrued Salaries, Current Anti-dilutive securities excluded from computation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Other Other Customer [Member] Estimated offering expenses for aggregate expenses Stock Issuance Costs Stock Issuance Costs Accretion of redeemable convertible preferred stock Temporary Equity, Accretion to Redemption Value, Adjustment Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Net exercise of common and preferred stock warrants Noncash Exercise of Stock Purchase Warrants Noncash Exercise of Stock Purchase Warrants Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Equity Component [Domain] Equity Component [Domain] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Document Transition Report Document Transition Report 2021 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Stock options Share-based Payment Arrangement, Option [Member] Remaining milestone obligation, fair value Milestone Contingency, Fair Value Disclosure Milestone Contingency, Fair Value Disclosure Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Net exercise of common and preferred stock warrants Stock Issued During Period, Value, Warrants Exercised, Net Stock Issued During Period, Value, Warrants Exercised, Net Net loss attributable to common stockholders (Note 2) Net Income (Loss) Available to Common Stockholders, Diluted Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 7) Adjustments to Additional Paid In Capital, Issuance of Temporary Equity Adjustments to Additional Paid In Capital, Issuance of Temporary Equity Proceeds from exercise of common stock warrants Proceeds from Warrant Exercises Income Statement [Abstract] Income Statement [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis]