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Fair value measurements - Summary of Change in Fair Value of Contingent Consideration (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]  
Beginning Balance $ 3,854
Preliminary purchase price 2,000
Fair value adjustments (360)
Accretion in value 532
Amounts cancelled (30)
Amounts paid to sellers (2,633)
Ending Balance $ 3,363