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Cost of revenues - Schedule of cost of revenuues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues $ 99,913 $ 115,667 $ 117,876
Bandwidth costs [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 57,093 48,118 68,441
Cost of inventories sold [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 7,181 31,634 21,485
Cost of live streaming [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 20,734 23,928 12,724
Depreciation of servers and other equipment [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 5,198 5,018 7,647
Payment handling charges [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues 1,658 3,016 4,855
Other Cost of revenues [Member]      
Contract Liabilities And Deferred Income [Line Items]      
Cost of revenues $ 8,049 $ 3,953 $ 2,724