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Share-based Compensation - Red Kingdom - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 15, 2017
Dec. 15, 2015
Apr. 03, 2014
May 31, 2014
Apr. 30, 2014
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total consideration           $ 157,654,695
Shares vested           2,309,490
Red Kingdom            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Ordinary shares issued     8,083,333      
Total consideration     $ 141,971      
Shares vested           811,667
Red Kingdom | Restricted Shares            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Share issued to secure services       6,459,167 350,000  
Compensation expenses, deemed service period       5 years    
Shares vested 811,667       1,038,333  
Unrecognized share-based compensation   $ 1,152,600        
Non-vested restricted shares repurchased 1,329,999          
Red Kingdom | Restricted Shares | Each yearly anniversary from the date of the agreement            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting percentage       20.00%    
Red Kingdom | Restricted Shares | Each the contractually agreed milestones within each year            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting percentage         20.00%  
Red Kingdom | Senior Management and Certain Advisors            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Ordinary shares issued     7,847,500      
Red Kingdom | CEO | Restricted Shares            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares vested   1,921,000