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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Gross deferred tax assets: |  |  |
Net operating loss carryforward | $ 9,587 | $ 5,717 |
Tax credits | 725 | 538 |
Accruals and reserves | 2,461 | 2,054 |
Alternative minimum tax credits | 89 | 157 |
Total gross deferred tax assets | 12,862 | 8,466 |
Less: valuation allowance | (11,814) | (8,088) | $ (7,753)
Total deferred tax assets net of valuation allowance | 1,048 | 378 |
Deferred tax liabilities: |  |  |
Property and equipment | (37) | (284) |
Accrual and reserves | (1,025) |  |
Net deferred tax liabilities | $ (14) |  |
Net deferred tax assets |  | $ 94 |

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