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Quarterly Results of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Foreign exchange gain (loss) | $ 6,274 | $ 4,349 | $ (982) | $ 8,750 | $ (23,258)
Stock-based compensation | 3,611 | 18,408 | 14,179 | 31,040 | 18,416
Loss attributable to fair value adjustments | 41,672 | 9,030 |  |  |
Impairment and other losses | $ 77,240 | $ 6,655 | 96,399 | 8,599 | $ 87,204
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | 129,000 |  |
Contingent Payment |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Loss attributable to fair value adjustments |  |  | $ 42,187 | $ 5,403 |

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