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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 | A reconciliation of the statutory U.S. federal rate to the Company’s effective tax rate is as follows:
| December 31,
| 2023 |  | 2022
Tax at federal statutory rate | 21.0 | % |  | 21.0 | %
State taxes, net of federal benefit | 4.5 | % |  | 7.2 | %
Research and development tax credit | 1.8 | % |  | 1.4 | %
Stock-based compensation | (0.8) | % |  | (1.9) | %
Nondeductible interest expense | (0.5) | % |  | (0.5) | %
FIN 48 reserve | (0.3) | % |  | (0.2) | %
Change in valuation allowance | (23.3) | % |  | (26.8) | %
Other | (2.4) | % |  | (0.2) | %
Total | — | % |  | — | %
Schedule of Deferred Tax Assets and Liabilities | The tax effects of temporary differences that give rise to significant components of the deferred tax assets and liabilities are as follows (in thousands):
| December 31,
| 2023 |  | 2022
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 41,864 |  |  | $ | 40,884 |
Research and development credits | 13,069 |  |  | 12,088 |
Research and development expenditures, capitalized for tax | 8,271 |  |  | 4,563 |
Fixed assets and inventory | 151 |  |  | 159 |
Accruals and reserves | 1,633 |  |  | 1,180 |
Interest expense carryforward | 5,033 |  |  | 3,850 |
Operating lease liability | 3,958 |  |  | 4,442 |
Other | 1,718 |  |  | 1,521 |
Gross deferred tax assets | 75,697 |  |  | 68,687 |
Deferred tax liabilities: |  |  |
Operating lease right-of-use asset | (3,436) |  |  | (3,910) |
Total deferred tax liabilities | (3,436) |  |  | (3,910) |
Valuation allowance | (72,261) |  |  | (64,777) |
Net deferred tax assets | $ | — |  |  | $ | — |
Schedule of Unrecognized Tax Benefits Roll Forward | A reconciliation of the beginning and ending unrecognized tax benefit amount is as follows (in thousands):
| Year Ended December 31,
| 2023 |  | 2022
Beginning balance | $ | 1,601 |  |  | $ | 1,489 |
Increase in balance related to tax positions taken during the current year | 136 |  |  | 112 |
Decrease in balance related to tax positions taken during prior years | (7) |  |  | — |
Ending balance | $ | 1,730 |  |  | $ | 1,601 |

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 12 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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