Consolidated Statements of Shareholders' (deficit) Equity - USD ($)
Total
Ordinary Shares
Additional Paid In Capital
Subscription Receivable
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2014 $ (2,950,677) $ 490 $ 1,687,048   $ (4,633,488) $ (4,727)
Balance, Shares at Dec. 31, 2014   8,166,666        
Issuance of ordinary shares upon vesting of restricted shares   $ 43 (42) $ (1)    
Issuance of ordinary shares upon vesting of restricted shares, Shares   718,518        
Share-based compensation 2,701,404   2,701,404      
Net loss (18,021,737)       (18,021,737)  
Foreign currency translation adjustments (98,893)         (98,893)
Balance at Dec. 31, 2015 (18,369,903) $ 533 4,388,410 (1) (22,655,225) (103,620)
Balance, Shares at Dec. 31, 2015   8,885,184        
Issuance of ordinary shares upon vesting of restricted shares   $ 46 (42) (4)    
Issuance of ordinary shares upon vesting of restricted shares, Shares   771,991        
Share-based compensation 4,925,278   4,925,278      
Net loss (37,512,212)       (37,512,212)  
Foreign currency translation adjustments (594,912)         (594,912)
Balance at Dec. 31, 2016 $ (51,551,749) $ 579 9,313,646 (5) (60,167,437) (698,532)
Balance, Shares at Dec. 31, 2016 9,657,175 9,657,175        
Issuance of ordinary shares upon vesting of restricted shares   $ 100 (87) (13)    
Issuance of ordinary shares upon vesting of restricted shares, Shares   1,666,145        
Exercise of shares option $ 65,500 $ 6 65,494      
Exercise of shares option, Shares 100,834 100,834        
Exercise of warrant $ 4,700,000 $ 28 4,699,972      
Exercise of warrant, Shares   461,808        
Conversion of convertible preferred shares to ordinary shares 163,607,144 $ 1,707 163,605,437      
Conversion of convertible preferred shares to ordinary shares, Shares   28,443,275        
Issuance of ordinary shares upon initial public offering, net of issuance cost 157,654,695 $ 575 157,654,120      
Issuance of ordinary shares upon initial public offering, Shares   9,583,333        
Share-based compensation 9,931,106   9,931,106      
Net loss (50,384,176)       (50,384,176)  
Foreign currency translation adjustments 1,148,440         1,148,440
Balance at Dec. 31, 2017 $ 235,170,960 $ 2,995 $ 345,269,688 $ (18) $ (110,551,613) $ 449,908
Balance, Shares at Dec. 31, 2017 49,912,570 49,912,570