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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Gross deferred tax assets: |  |  |
Net operating loss carryforward | $ 20,702 | $ 12,684 |
Tax credits | 199 | 92 |
Accruals and reserves | 2,333 | 2,113 |
Property and equipment | 102 | 83 |
Alternative minimum tax credits | 21 | 21 |
Total gross deferred tax assets | 23,357 | 14,993 |
Less: valuation allowance | (22,738) | (14,281) | $ (11,814)
Total deferred tax assets net of valuation allowance | 619 | 712 |
Deferred tax liabilities: |  |  |
Accrual and reserves | (550) | (678) |
Net deferred tax assets (liabilities) | $ 69 | $ 34 |

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