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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
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:
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |
Federal statutory income tax rate |  |  | 21 | % |  |  | 21 | %
State income taxes, net of federal benefit |  |  | 1 |  |  |  | 5 |
Research and developments credits |  |  | 1 |  |  |  | 1 |
Permanent items |  |  | (3 | ) |  |  | (4 | )
Change in valuation allowance |  |  | (20 | ) |  |  | (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):
|  | As of December 31, |
|  | 2023 |  |  | 2022 |
Deferred Tax Assets: |  |  |  |  |  |
Net operating loss carryforwards |  | $ | 72,722 |  |  | $ | 70,822 |
Research and development tax credits |  |  | 4,149 |  |  |  | 3,807 |
Interest expense limitation |  |  | 5,120 |  |  |  | 3,036 |
Property and equipment |  |  | — |  |  |  | 234 |
Capitalized research costs |  |  | 4,281 |  |  |  | 2,874 |
Share-based compensation |  |  | 1,685 |  |  |  | 1,619 |
Lease liability |  |  | 6,398 |  |  |  | — |
Accruals and reserves |  |  | 667 |  |  |  | 1,932 |
Total |  |  | 95,022 |  |  |  | 84,324 |
Valuation allowance |  |  | (93,023 | ) |  |  | (82,552 | )
Total deferred tax assets after valuation allowance |  |  | 1,999 |  |  |  | 1,772 |
Deferred Tax Liabilities: |  |  |  |  |  |
Property and equipment |  |  | (4 | ) |  |  | — |
Right-of-Use Asset |  |  | (692 | ) |  |  | — |
Intangible assets |  |  | (1,303 | ) |  |  | (1,772 | )
Total deferred tax liabilities |  |  | (1,999 | ) |  |  | (1,772 | )
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, |
|  | 2023 |  |  | 2022 |
Balance at January 1 |  | $ | 952 |  |  | $ | 843 |
Additions for tax positions related to the current year |  |  | 57 |  |  |  | 109 |
Additions for tax positions related to prior years |  |  | 28 |  |  |  | — |
Reductions for tax positions related to prior years |  |  | — |  |  |  | — |
Reductions related to settlements |  |  | — |  |  |  | — |
Reductions related to a lapse of statute |  |  | — |  |  |  | — |
Balance at December 31 |  | $ | 1,037 |  |  | $ | 952 |

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