XML 99 R67.htm IDEA: XBRL DOCUMENT v3.22.1
Summary of significant accounting policies - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Accounting Policies and General Information [Line Items]            
Allowance for doubtful accounts   $ 1,764,000 $ 9,329,000 $ 7,604,000   $ 7,709,000
Impairment of long-term investments     794,000 19,831,000    
Cash flow projection period   5 years        
Discount rate   18.20%        
Terminal Growth Rate to extrapolate the cash flows beyond five-year period   2.00%        
Goodwill impairment losses   $ 0 0 0    
External advertising and market promotion expenses from continuing operations   $ 15,052,000 11,026,000 20,974,000    
Value added tax on revenues 16.00% 13.00%        
Value added tax on sub-licensing revenues   6.00%        
Employee benefit costs   $ 12,411,000 $ 7,949,000 $ 12,337,000    
Statutory general reserve rate   10.00%        
Statutory general reserve rate of registered capital   50.00%        
Dividends declared   $ 0 $ 0 $ 0    
Right-of-use assets   $ 27,000 $ 1,954,000 $ 8,747,000    
Lease liabilities   25,000 1,988,000      
Shenzhen Mojingou Information Service Co., Ltd [Member]            
Accounting Policies and General Information [Line Items]            
Income (Loss) from Equity Method Investments   0 0 0    
Long-term Investments [Member]            
Accounting Policies and General Information [Line Items]            
Impairment of long-term investments   0 794,000 19,831,000    
Income (Loss) from Equity and Cost Method Investments   $ 42,000 $ 214,000 $ 579,000    
Minimum            
Accounting Policies and General Information [Line Items]            
Term of time-based subscriptions   1 month        
Maximum [Member]            
Accounting Policies and General Information [Line Items]            
Term of time-based subscriptions   12 months        
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | China [Member] | Minimum            
Accounting Policies and General Information [Line Items]            
Percent of revenue   95.00% 95.00% 95.00%    
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Adjustment            
Accounting Policies and General Information [Line Items]            
Right-of-use assets         $ 11,800,000  
Lease liabilities         $ 11,400,000  
Land use rights            
Accounting Policies and General Information [Line Items]            
Other intangible assets, amortization period   30 years