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Fair Value Measurements - Summary of Changes in the Carrying Amount of Contingent Consideration Obligations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition, Contingent Consideration [Line Items]    
Fair value, beginning of the year $ (1,725) $ (1,004)
Consideration payable   (786)
Net changes in fair value 753 65
Fair value, end of the year $ (972) $ (1,725)