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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 | The effective income tax rate of the provision for income taxes differs from the federal statutory rate as follows:
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Federal statutory income tax rate |  |  | 21 | % |  |  | 21 | %
State income taxes, net of federal benefit |  |  | 2 |  |  |  | 4 |
Research and developments credits |  |  | (1 | ) |  |  | 2 |
Permanent items |  |  | (6 | ) |  |  | (4 | )
Change in valuation allowance |  |  | (16 | ) |  |  | (23 | )
Effective income tax rate |  |  | — | % |  |  | — | %
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant portions of the deferred income tax assets and liabilities are as follows (in thousands):
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Deferred Tax Assets: |  |  |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 53,128 |  |  | $ | 50,360 |
Research and development tax credits |  |  | 2,860 |  |  |  | 3,040 |
Property and equipment |  |  | 279 |  |  |  | 370 |
Stock-based compensation |  |  | 865 |  |  |  | — |
Accruals and reserves |  |  | 1,406 |  |  |  | 286 |
Total |  |  | 58,538 |  |  |  | 54,056 |
Valuation allowance |  |  | (56,083 | ) |  |  | (51,135 | )
Total deferred tax assets after valuation allowance |  |  | 2,455 |  |  |  | 2,921 |
Deferred Tax Liabilities: |  |  |  |  |  |  |  |
Intangible assets |  |  | (2,455 | ) |  |  | (2,921 | )
Total deferred tax liabilities |  |  | (2,455 | ) |  |  | (2,921 | )
Net deferred tax assets and liabilities |  | $ | — |  |  | $ | — |
Reconciliation of Unrecognized Tax Benefits | A reconciliation of beginning and ending balances for unrecognized tax benefits is as follows (in thousands):
|  | Year Ended December 31, |
|  | 2020 |
Balance at January 1 |  | $ | — |
Additions for tax positions related to the current year |  |  | 106 |
Additions for tax positions related to prior years |  |  | 609 |
Reductions for tax positions related to prior years |  |  | — |
Reductions related to settlements |  |  | — |
Reductions related to a lapse of statute |  |  | — |
Balance at December 31 |  | $ | 715 |

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