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Property and equipment, net - Summary of Depreciation Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 6,319 $ 9,277 $ 5,824
Cost of revenues.      
Property, Plant and Equipment [Line Items]      
Depreciation expense 4,805 6,247 5,198
Research and development expenses      
Property, Plant and Equipment [Line Items]      
Depreciation expense 436 529 300
General and administrative expenses      
Property, Plant and Equipment [Line Items]      
Depreciation expense 1,068 2,492 317
Sales and marketing expenses      
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 10 $ 9 $ 9