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Fair Value Measurements - Schedule of roll-forward of fair value of earn-out consideration categorized as level 3 in fair value hierarchy (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Interest payment on earn-out consideration, cash flows from operating activities |  | $ 0 |  | $ 0
Interest payment on earn-out consideration, revenue | $ 440,000 |  | $ 440,000 |
Business Acquisition Contingent Consideration |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Opening balance | 5,716,000 | 21,935,000 | 8,272,000 | 22,184,000
Payments made on earn-out consideration | 0 | 0 | (2,556,000) | 0
Change in fair value of earn out consideration | 0 | (3,773,000) | 0 | (4,452,000)
Others | 440,000 | 0 | 440,000 | 430,000
Closing balance | $ 6,156,000 | $ 18,162,000 | $ 6,156,000 | $ 18,162,000

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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=117815213&loc=d3e19207-110258 + Details
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