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Fair Value Measurements - Schedule of Reconciliation of the Change in the Fair Value of Contingent Consideration - Earnout (Detail) - Contingent Consideration - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Balance as of December 31, 2020 | $ 79,962 | $ 0
Acquisition date fair value of contingent consideration - earnout | 79,962 |
Change in fair value | 0 |
Balance as of September 30, 2021 | $ 79,962 |

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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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