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Costs of revenues - Schedule of cost of revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contract Liabilities And Deferred Income [Line Items]      
Total $ 118,603 $ 92,637 $ 99,913
Bandwidth costs [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Total 80,720 62,384 57,093
Cost of inventories sold [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Total 1,516 1,660 7,181
Revenue-sharing from live streaming business      
Contract Liabilities And Deferred Income [Line Items]      
Total 26,506 15,640 20,734
Depreciation of servers and other equipment [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Total 4,805 6,247 5,198
Payment handling fees [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Total 3,066 1,459 1,658
Other costs (note) [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Total $ 1,990 $ 5,247 $ 8,049