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Cash and cash equivalents - Summary of Cash and cash equivalents (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Cash And Cash Equivalents [Line Items]        
Cash $ 120,928 $ 51,955    
Short-term investments, classified as cash equivalents 78 6,602    
Cash and cash equivalents $ 121,006 $ 58,557 $ 29,762 $ 5,509