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Commitment and Contingencies - Summary of liability related to estimated contingent consideration (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Combination, Contingent Consideration Arrangements, Change In Amount Of Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | $ 20,667 | $ 15,820 | $ 18,250 | $ 17,610
Fair value adjustment | 13,591 | 1,968 | 16,008 | 178
IRS Settlement |  |  |  | (2,727)
Fair value adjustment |  |  |  | 2,905
Ending balance | 34,258 | 17,788 | 34,258 | 17,788
Array | TRA |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change In Amount Of Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 18,845 | 15,378 | 17,808 | 17,168
Fair value adjustment | (521) | 1,968 | 516 |
IRS Settlement |  |  |  | (2,727)
Fair value adjustment |  |  |  | 2,905
Ending balance | 18,324 | 17,346 | 18,324 | 17,346
Array | Earn-Out Liability |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change In Amount Of Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 1,822 | 442 | 442 | 442
Fair value adjustment | 14,112 | 0 | 15,492 |
IRS Settlement |  |  |  | 0
Fair value adjustment |  |  |  | 0
Ending balance | $ 15,934 | $ 442 | $ 15,934 | $ 442

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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=121586364&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=120321790&loc=d3e7008-128479 + Details
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