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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |
Increase (decrease) in valuation allowance during the year | $ 1.1 | $ 0.9
Percentage of limitation on federal and state net operating loss carryforwards | 97.00% |
Percentage of limitation on federal tax credit carryforwards | 96.00% |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, amount | $ 205.2 |
Net operating loss carryforwards available before expiration | 11.3 |
Federal | Research and development |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards with expiration | 8.7 |
State |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, amount | 127.0 |
Net operating loss carryforwards available before expiration | 9.5 |
State | Research and development |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards without expiration | $ 8.4 |
Earliest Tax Year |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2025 |
Latest Tax Year |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, expiration year | 2037 |

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