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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Benefit recognized for net operating loss carryforwards | $ 0 |  |  |
Increase in valuation allowance | 35,400,000 | $ 22,000,000.0 |  |
Net operating loss carryforwards, federal | 368,200,000 |  |  |
Net operating loss carryforwards, state | 218,700,000 |  |  |
Unrecognized income tax benefit | 2,302,000 | 1,842,000 | $ 1,459,000 | $ 943,000
Unrecognized tax benefit | 2,300,000 | 1,800,000 | 1,500,000 |
Accrued interest and penalties | 0 | $ 0 | $ 0 |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforwards available to reduce future taxable income | 6,900,000 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforwards available to reduce future taxable income | $ 3,100,000 |  |  |

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