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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 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Assets |  |  |
Total assets | $ 224,993 |  | $ 157,091
Money Market Funds |  |  |
Assets |  |  |
Total assets | 71,374 |  | 23,128
U.S. Treasuries |  |  |
Assets |  |  |
Total assets | 28,465 |  | 32,579
U.S. Government Agency Securities |  |  |
Assets |  |  |
Total assets | 47,472 |  | 40,321
Corporate Debt Securities |  |  |
Assets |  |  |
Total assets | 77,682 |  | 61,063
Warrant Liability |  |  |
Liabilities |  |  |
Total liabilities | 31,737 | $ 10,736 |
Fair Value, Inputs, Level 1 |  |  |
Assets |  |  |
Total assets | 71,374 |  | 23,128
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Assets |  |  |
Total assets | 71,374 |  | 23,128
Fair Value, Inputs, Level 2 |  |  |
Assets |  |  |
Total assets | 153,619 |  | 133,963
Fair Value, Inputs, Level 2 | U.S. Treasuries |  |  |
Assets |  |  |
Total assets | 28,465 |  | 32,579
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities |  |  |
Assets |  |  |
Total assets | 47,472 |  | 40,321
Fair Value, Inputs, Level 2 | Corporate Debt Securities |  |  |
Assets |  |  |
Total assets | 77,682 |  | $ 61,063
Fair Value, Inputs, Level 3 | Warrant Liability |  |  |
Liabilities |  |  |
Total liabilities | $ 31,737 | $ 10,736 |

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