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Summary of significant accounting policies - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 01, 2018
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Dec. 31, 2016
Accounting Policies and General Information [Line Items]              
Allowance for doubtful accounts     $ 7,604,000 $ 7,709,000 $ 31,000   $ 119,000
Impairment of long-term investments     19,831,000 7,794,000 596,000    
Goodwill impairment losses     0 0 0    
Sales rebates provided to the agencies and advertisers     0 394,000 440,000    
External advertising and market promotion expenses from continuing operations     $ 20,974,000 22,935,000 10,345,000    
Value added tax on revenues 17.00% 16.00% 13.00%        
Value added tax on sub-licensing revenues     6.00%        
Employee benefit costs     $ 12,337,000 $ 12,501,000 $ 10,123,000    
Statutory general reserve rate     10.00%        
Statutory general reserve rate of registered capital     50.00%        
Dividends declared     $ 0 $ 0 $ 0    
Income (Loss) from Equity Method Investments     $ 0 $ (307,000) $ (1,875,000)    
Disposal Group, Including Discontinued Operation, Revenue     0 656,000 11,428,000    
Right-of-use assets     8,747,000 11,819,000      
Lease liabilities     8,825        
Shenzhen Mojingou Information Service Co., Ltd [Member]              
Accounting Policies and General Information [Line Items]              
Income (Loss) from Equity Method Investments     0 300,000 1,300,000    
Long-term Investments [Member]              
Accounting Policies and General Information [Line Items]              
Impairment of long-term investments     19,830,000 $ 7,790,000 600,000    
Income (Loss) from Equity Method Investments     $ 579,000   $ (187,000)    
Restatement Adjustment [Member] | Accounting Standards Update 2016-02 [Member]              
Accounting Policies and General Information [Line Items]              
Right-of-use assets           $ 11,800,000  
Lease liabilities           $ 11,400,000  
Minimum              
Accounting Policies and General Information [Line Items]              
Term of time-based subscriptions     1 month        
Minimum | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | China [Member]              
Accounting Policies and General Information [Line Items]              
Percent of revenue     99.00% 99.00% 99.00%    
Minimum | Non Exclusive Game Licenses [Member]              
Accounting Policies and General Information [Line Items]              
Estimated life of user relationship with the Group     1 month        
Minimum | Exclusive Game Licenses [Member]              
Accounting Policies and General Information [Line Items]              
Estimated life of user relationship with the Group     1 month        
Maximum              
Accounting Policies and General Information [Line Items]              
Term of time-based subscriptions     12 months        
Advertising contract term     3 months        
Maximum | Non Exclusive Game Licenses [Member]              
Accounting Policies and General Information [Line Items]              
Estimated life of user relationship with the Group     10 months        
Maximum | Exclusive Game Licenses [Member]              
Accounting Policies and General Information [Line Items]              
Estimated life of user relationship with the Group     6 months        
Exclusive Game Licenses [Member]              
Accounting Policies and General Information [Line Items]              
Other intangible assets, amortization period     3 years        
Computer Software Internal Use Software and Domain Names [Member]              
Accounting Policies and General Information [Line Items]              
Other intangible assets, amortization period     5 years        
Land use right [Member]              
Accounting Policies and General Information [Line Items]              
Other intangible assets, amortization period     30 years        
Audio Visual License [Member]              
Accounting Policies and General Information [Line Items]              
Other intangible assets, amortization period     9 years