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Deferred Acquisition Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Beginning balance of contingent payments | $ 82,802 | $ 74,671 | $ 74,671
Payments | 1,153 |  | 46,792
Redemption value adjustments | 12,392 | (2,575) | 44,993
Additions | 0 |  | 7,703
Foreign translation adjustment | (641) |  | 2,227
Ending balance of contingent payments | 93,400 |  | 82,802
Deferred acquisition consideration | 93,400 |  | 83,065
Stock-based compensation | 707 | 2,025 |
Fixed payments |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Deferred acquisition consideration | 0 |  | $ 263
Contingent Payment |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Loss (income) attributable to fair value adjustments | $ 11,685 | $ (4,600) |

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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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