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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards subject to expiration | $ 2,100,000 |
Valuation allowance amount | 332,200,000 | $ 330,100,000
Tax benefits credited to additional paid-in capital | 55,700,000 |
Unrecognized tax benefits | $ 0 |
Possible extension period of tax holiday | 3 years |
Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 438,800,000 |
Research and development tax credit carryforwards | 54,400,000 |
Research and development tax credit carryforwards subject to expiration | 100,000 |
State and Local Jurisdiction |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 324,100,000 |
Research and development tax credit carryforwards | 52,700,000 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 124,100,000 |
Decrease in foreign taxes from tax holiday | $ 200,000 |

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