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Fair value measurements - Summary of Change in Fair Value of Contingent Consideration (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 4,004
Preliminary purchase price 6,000
Fair value adjustments (296)
Accretion in value 705
Amounts cancelled (36)
Amounts paid to sellers (910)
Ending balance $ 9,467