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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate | The reconciliation of the federal statutory income tax rate to the Company’s effective income tax rate is as follows:
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Income tax benefit at the federal statutory rate |  |  | 21.0 | % |  |  | 21.0 | %
State income taxes, net of federal benefit |  | 3.2 |  |  |  | 1.1 |
Research and development tax credits |  | 1.3 |  |  |  | 2.8 |
Other |  |  | (0.6 | ) |  |  | (0.3 | )
Mark to market gain/loss |  | 1.7 |  |  |  | — |
Change in valuation allowance |  |  | (26.6 | ) |  |  | (24.6 | )
Total |  |  | — | % |  |  | — | %
Schedule of Components of Deferred Tax Assets | The principal components of the Company’s net deferred tax assets consisted of the following (in thousands):
|  | December 31, |
|  | 2020 |  |  | 2019 |
Deferred tax assets |  |  |  |  |  |  |  |
Federal and state net operating loss carryforwards |  | $ | 27,567 |  |  | $ | 21,262 |
Research and development tax credits |  |  | 4,887 |  |  |  | 4,140 |
Other |  |  | 748 |  |  |  | 488 |
Gross deferred tax assets |  |  | 33,202 |  |  |  | 25,890 |
Less: valuation allowance |  |  | (33,141 | ) |  |  | (25,841 | )
Total deferred tax assets |  |  | 61 |  |  |  | 49 |
Deferred tax liabilities |  |  |  |  |  |  |  |
Depreciation |  |  | (61 | ) |  |  | (49 | )
Total deferred tax liabilities |  |  | (61 | ) |  |  | (49 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
Schedule of Reconciliation of Unrecognized Tax Benefits | A reconciliation of the unrecognized tax benefit is as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |
Balance—beginning of year |  | $ | 1,406 |  |  | $ | 873 |
Addition based on tax position related to current year |  |  | 406 |  |  |  | 533 |
Addition based on tax position related to prior year |  |  | 169 |  |  |  | — |
Balance—end of year |  | $ | 1,981 |  |  | $ | 1,406 |

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