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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |
U.S. federal statutory tax rate | 21.00% | 21.00% | 34.00%
Valuation allowance | $ 7,455,000 | $ 7,659,000 |
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 | 3,000 | 2,000 |
Income tax interest and penalties | 1,000 | 1,000 | $ 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 | $ 19,000,000 |  |
Net operating loss carry forwards, expire period | 2020 |  |
Operating loss carryforward available to offset future taxable income |  | $ 1,600,000 |
Percentage of future taxable income offset by operating loss carryforward | 80.00% |  |
Tax credit carry forwards | $ 1,500,000 |  |
Tax credit carry forwards, expire period | 2026 |  |
State |  |  |
Income Taxes [Line Items] |  |  |
Tax credit carry forwards | $ 1,500,000 |  |

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