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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Line Items] |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% |
Valuation allowance | $ 8,520,000 | $ 7,455,000 |
Increase in valuation allowance | $ 1,100,000 |  |
Cumulative change in ownership percentage | 50.00% |  |
Period for cumulative change in ownership | 3 years |  |
Unrecognized tax benefit that would impact effective tax rate, if recognized | $ 9,000 |  |
Income tax interest and penalties accrued | 61,000 | 3,000 |
Income tax interest and penalties | 57,000 | $ 1,000 |
California |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | $ 5,700,000 |  |
Net operating loss carry forwards, expire period | 2028 |  |
Federal |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss carry forwards | $ 19,900,000 |  |
Net operating loss carry forwards, expire period | 2022 |  |
Operating loss carryforward available to offset future taxable income | $ 2,600,000 |  |
Percentage of future taxable income offset by operating loss carryforward |  |  | 80.00%
Tax credit carry forwards | $ 1,300,000 |  |
Tax credit carry forwards, expire period | 2026 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carry forwards | $ 1,400,000 |  |

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