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Deferred Acquisition Consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Payments |  |  | $ 30,719 |  |
Redemption value adjustments | $ 3,483 | $ 14,079 | (2,617) |  |
Additions |  |  | 6,344 |  |
Foreign translation adjustment |  |  | 35 |  |
Ending balance of contingent payments | 55,641 |  | 55,641 |  |
Deferred acquisition consideration | 56,190 |  | 56,190 |  |
Stock-based compensation | 1,540 | 3,076 | 1,010 | $ 7,758 |
Fixed payments |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Deferred acquisition consideration |  |  |  |  | $ 549
Contingent Payment |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
(Income) loss attributable to fair value adjustments | $ 1,943 | $ 11,003 | $ (3,627) | $ 8,522 |

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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=109223946&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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