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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Total assets | $ 174,163 | $ 147,017
Liabilities |  |
Total liabilities |  | 21,808
Money Market Funds |  |
Assets |  |
Total assets | 25,138 | 27,854
U.S. Treasuries |  |
Assets |  |
Total assets | 30,673 | 6,517
U.S. Government Agency Securities |  |
Assets |  |
Total assets | 48,417 | 51,273
Corporate Debt Securities |  |
Assets |  |
Total assets | 69,935 | 61,373
Warrant Liability |  |
Liabilities |  |
Total liabilities | 10,660 | 14,860
Sublicense Liability |  |
Liabilities |  |
Total liabilities |  | 6,948
Fair Value, Inputs, Level 1 |  |
Assets |  |
Total assets | 25,138 | 27,854
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Assets |  |
Total assets | 25,138 | 27,854
Fair Value, Inputs, Level 2 |  |
Assets |  |
Total assets | 149,025 | 119,163
Fair Value, Inputs, Level 2 | U.S. Treasuries |  |
Assets |  |
Total assets | 30,673 | 6,517
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities |  |
Assets |  |
Total assets | 48,417 | 51,273
Fair Value, Inputs, Level 2 | Corporate Debt Securities |  |
Assets |  |
Total assets | 69,935 | 61,373
Fair Value, Inputs, Level 3 |  |
Liabilities |  |
Total liabilities |  | 21,808
Fair Value, Inputs, Level 3 | Warrant Liability |  |
Liabilities |  |
Total liabilities | $ 10,660 | 14,860
Fair Value, Inputs, Level 3 | Sublicense Liability |  |
Liabilities |  |
Total liabilities |  | $ 6,948

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