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Deferred Acquisition Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning balance of contingent payments |  |  | $ 74,671 | $ 82,598
Payments |  |  | 46,792 | 30,719
Redemption value adjustments |  |  | 44,993 | 15,451
Additions |  |  | 7,703 | 7,145
Foreign translation adjustment |  |  | 2,227 | 196
Ending balance of contingent payments | $ 82,802 | $ 74,671 | 82,802 | 74,671
Deferred acquisition consideration | 83,065 | 75,220 | 83,065 | 75,220
Loss attributable to fair value adjustments | 41,672 | 9,030 |  |
Stock-based compensation |  |  | 2,806 | 10,048
Fixed payments |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Deferred acquisition consideration | $ 263 | $ 549 | 263 | 549
Contingent Payment |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Loss attributable to fair value adjustments |  |  | $ 42,187 | $ 5,403

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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