Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-based Compensation - Summary of the Share Options Activities (Details)

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Share-based Compensation - Summary of the Share Options Activities (Details) - Options - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of shares        
Outstanding at the beginning of the period (in shares)   402,500 1,142,212 2,377,067
Granted (in shares)   424,698 70,000 1,053,150
Exercised (in shares)       (119,792)
Forfeited (in shares)     (809,712) (123,438)
Cancelled (in shares) (1,772,584)     (1,901,752)
Expired (in shares)       (143,023)
Outstanding at the end of the period (in shares)   827,198 402,500 1,142,212
Vested and expected to vest at the end of the period (in shares)   827,198    
Exercisable at the end of the period (in shares)   235,832    
Weighted average exercise        
Outstanding at the beginning of the period (in dollars per share)   $ 0.75 $ 0.67 $ 2.18
Granted (in dollars per share)   1.26 0.50 0.58
Exercised (in dollars per share)       1.77
Forfeited (in dollars per share)     0.61 1.71
Cancelled (in dollars per share)       2.13
Expired (in dollars per share)       3.89
Outstanding at the end of the period (in dollars per share)   1.01 $ 0.75 $ 0.67
Vested and expected to vest at the end of the period (in dollars per share)   1.01    
Exercisable at the end of the period (in dollars per share)   $ 0.87    
Weighted remaining contractual Years        
Vested and expected to vest at the end of the period   8 years 1 month 9 days    
Exercisable at the end of the period   7 years 4 months 20 days    
Aggregate intrinsic value        
Vested and expected to vest at the end of the period (in dollars)   $ 6,700    
Exercisable at the end of the period (in dollars)   $ 3,385