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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 19,197 | $ 8,165 |
Research and development tax credit carryforwards | 6,470 | 5,040 |
Accrued expenses and other current liabilities | 566 | 671 |
Intangible assets | 1,598 | 33 |
Property and equipment | 220 | 215 |
Stock-based compensation | 3,092 | 1,463 |
Operating lease liability | 2,829 |  |
Other | 221 | 725 |
Total deferred tax assets | 34,193 | 16,312 |
Valuation allowance | (30,558) | (15,292) | $ (11,257)
Net deferred tax assets | 3,635 | 1,020 |
Deferred tax liabilities: |  |  |
Capitalized software development costs | (1,088) | (1,020) |
Operating lease right-of-use assets | (2,547) |  |
Deferred tax liabilities | (3,635) | (1,020) |
Net deferred tax assets and liabilities | $ 0 | $ 0 |

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