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Summary of significant accounting policies - Analysis of Different Types of Revenues (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net revenues      
Product revenue $ 1,412 $ 8,269 $ 54,604
Live streaming revenue 20,866 26,920 31,031
Total 186,683 181,267 232,132
Subscription and circulation [Member]      
Net revenues      
Revenue from Contract with Customer, Including Assessed Tax 84,299 81,532 81,877
Advertising      
Net revenues      
Revenue from Contract with Customer, Including Assessed Tax 13,206 15,643 27,781
Product and Service, Other [Member]      
Net revenues      
Revenue from Contract with Customer, Including Assessed Tax $ 66,900 $ 48,903 $ 36,839