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Significant accounting policies - Schedule of Supplemental Disclosure of Cash Flow Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2020
Noncash investing activities:        
Intangible assets acquired in asset acquisitions $ 1,575 $ 1,600 $ 2,015  
Contingent consideration recognized at acquisition date $ 375   $ 25,491 $ 375