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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |
U.S. federal corporate tax rate | 21.00% | 35.00%
Federal AMT tax |  | $ 0.2
Decrease in valuation allowance during the year | $ (56.9) | $ (20.6)
Percentage of limitation on federal and state net operating loss carryforwards | 98.00% |
Percentage of limitation on federal tax credit carryforwards | 100.00% |
Federal |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, amount | $ 196.4 |
Net operating loss carryforwards available before expiration | 2.5 |
Federal | Research and development |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards with expiration | 9.0 |
State |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards, amount | 119.9 |
Net operating loss carryforwards available before expiration | 2.2 |
State | Research and development |  |
Income Taxes [Line Items] |  |
Tax credit carryforwards without expiration | $ 8.2 |
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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