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Cost of revenues - Schedule of cost of revenuues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues $ 92,637 $ 99,913 $ 115,667
Bandwidth costs [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 62,384 57,093 48,118
Cost of inventories sold [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 1,660 7,181 31,634
Cost of live streaming [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 15,640 20,734 23,928
Depreciation of servers and other equipment [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 6,247 5,198 5,018
Payment handling charges [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 1,459 1,658 3,016
Other Cost of revenues [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues $ 5,247 $ 8,049 $ 3,953