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Fair Value Measurements - Schedule of Changes in Contingent Consideration Liability (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |  |
Beginning balance | $ 0 | $ 6,069 | $ 17,125
Contingent consideration liabilities | 2,882 |  |
Payments made | 0 | 0 | 0
Revaluation |  | (6,069) | (11,056)
Ending balance | $ 2,882 | $ 0 | $ 6,069

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