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Accounting Policies - Schedule of Company's Level 3 Financial Liabilities Related to Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021
Business Acquisition Contingent Consideration [Line Items] |  |
Change in fair value of contingent consideration | $ 12,864 | $ 12,864
Purchase Price Allocation [Member] | Level 3 [Member] |  |
Business Acquisition Contingent Consideration [Line Items] |  |
Contingent consideration |  | 1,136
Change in fair value of contingent consideration |  | 12,864
Contingent consideration payments |  | (338)
Balance at September 30, 2021 | $ 13,662 | $ 13,662

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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=123570139&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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