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

Share-based Compensation - Summary of the Non-vested Shares Activities (Details)

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Share-based Compensation - Summary of the Non-vested Shares Activities (Details) - Non-vested shares - $ / shares
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)   603,088 1,102,136 1,795,498
Granted (in shares)   77,500    
Vested (in shares)   (419,752) (484,678) (693,362)
Forfeited (in shares)   (61,500) (14,370)  
Cancelled (in shares) (557,470)      
Outstanding at the end of the period (in shares)   199,336 603,088 1,102,136
Weighted average grant date fair value        
Outstanding at the beginning of the period (in dollars per share)   $ 0.955 $ 0.933 $ 0.951
Granted (in dollars per share)   1.545    
Vested (in dollars per share)   1.112 1.043 0.885
Forfeited (in dollars per share)   1.545 0.907  
Outstanding at the end of the period (in dollars per share)   $ 0.671 $ 0.955 $ 0.933