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Income Taxes - Foreign Currency Exchange Rate Fluctuations, Changes in Net Operating Losses and Credit Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating Loss Carryforwards |  |
CARES act tax rate benefit (as a percent) | 20.90% |
Valuation allowance (as a percent) | 41.10% |
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract] |  |
Provision for U.S. federal and state taxes on cumulative foreign earnings | $ 0 |
State |  |
Operating Loss Carryforwards |  |
Research and development tax credit carryforwards | 0 |
Foreign |  |
Deferred Tax Liability Not Recognized, Undistributed Earnings of Foreign Subsidiaries [Abstract] |  |
Provision for U.S. federal and state taxes on cumulative foreign earnings |  | $ 0
Federal |  |
Operating Loss Carryforwards |  |
Research and development tax credit carryforwards | $ 645 |

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