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Income Taxes (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes | $ 2,873,000 | $ (9,061,000) | $ 3,428,000 | $ (10,413,000) |  |
Effective income tax rate (percent) | 14.00% | 54.20% | 7.80% | (327.10%) |  |
Valuation allowance | $ 300,000 |  | $ 300,000 |  | $ 300,000 | $ 0
Accrued interest and penalties related to unrecognized tax benefits | $ 100,000 |  | 100,000 |  |  | $ 100,000
Research Tax Credit Carryforward |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Unrecognized tax benefits |  |  | $ (200,000) | $ (200,000.0) |  |

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