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Summary of significant accounting policies - Analysis of Different Types of Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net revenues      
Net revenues $ 239,601 $ 186,683 $ 181,267
Subscription revenue      
Net revenues      
Net revenues 91,174 84,299 81,532
Product revenue      
Net revenues      
Net revenues 1,897 1,412 8,269
Live streaming revenue      
Net revenues      
Net revenues 35,102 20,866 26,920
Advertising      
Net revenues      
Net revenues 12,267 13,206 15,643
Product and Service, Other [Member]      
Net revenues      
Net revenues $ 99,161 $ 66,900 $ 48,903