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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | A reconciliation of the U.S. federal statutory income tax rate to the Company’s effective income tax rate is as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Federal statutory income tax rate |  |  | 21.0 | % |  |  | 21.0 | %
State taxes, net of federal benefit |  |  | 4.2 |  |  |  | 5.5 |
Federal and state research and development tax credits |  |  | 12.4 |  |  |  | 19.4 |
Nondeductible items |  |  | (0.7 | ) |  |  | (1.6 | )
Stock-based compensation |  |  | 97.2 |  |  |  | 13.3 |
Other |  |  | 2.2 |  |  |  | (0.9 | )
Change in valuation allowance |  |  | (136.3 | ) |  |  | (56.7 | )
Effective income tax rate |  |  | — | % |  |  | — | %
Schedule of Deferred Tax Assets and Liabilities | Net deferred tax assets as of December 31, 2020 and 2019 consisted of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
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 | )
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 |  | $ | — |  |  | $ | — |
Summary of Changes in Valuation Allowance | The changes in the valuation allowance were as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Valuation allowance as of beginning of year |  | $ | 15,292 |  |  | $ | 11,257 |
Increases recorded to tax provision |  |  | 15,266 |  |  |  | 4,035 |
Valuation allowance as of end of year |  | $ | 30,558 |  |  | $ | 15,292 |

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