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, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of shares        
Outstanding at the beginning of the period (in shares)   827,198 402,500 1,142,212
Granted (in shares)   181,750 424,698 70,000
Exercised (in shares)   (62,416)    
Forfeited (in shares)   (135,700)   (809,712)
Cancelled (in shares) (1,772,584)      
Outstanding at the end of the period (in shares)   810,832 827,198 402,500
Vested and expected to vest at the end of the period (in shares)   810,832    
Exercisable at the end of the period (in shares)   260,500    
Weighted average exercise        
Outstanding at the beginning of the period (in dollars per share)   $ 1.01 $ 0.75 $ 0.67
Granted (in dollars per share)   0.57 1.26 0.50
Exercised (in dollars per share)   0.58    
Forfeited (in dollars per share)   0.57   0.61
Outstanding at the end of the period (in dollars per share)   1.02 $ 1.01 $ 0.75
Vested and expected to vest at the end of the period (in dollars per share)   1.02    
Exercisable at the end of the period (in dollars per share)   $ 0.85    
Weighted remaining contractual Years        
Vested and expected to vest at the end of the period   7 years 2 months 23 days    
Exercisable at the end of the period   6 years 5 months 8 days    
Aggregate intrinsic value        
Vested and expected to vest at the end of the period (in dollars)   $ 58    
Exercisable at the end of the period (in dollars)   $ 38