Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Summary of Number of RSUs Granted and Weighted-average Grant Date Fair Value of RSUs (Details)

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Share-Based Compensation - Summary of Number of RSUs Granted and Weighted-average Grant Date Fair Value of RSUs (Details) - Restricted Share Units (RSUs) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Shares, RSUs outstanding Beginning Balance 31,367 36,924  
Number of Shares, Granted   31,367 36,924
Number of Shares, Shares vested (25,664) (36,924)  
Number of Shares, Forfeited (5,703)    
Number of Shares, RSUs outstanding Ending Balance   31,367 36,924
Weighted average grant date fair value per share, RSUs outstanding Beginning Balance $ 7.01 $ 13.00  
Weighted average grant date fair value per share, Granted   7.01 $ 13.00
Weighted average grant date fair value per share, Shares Vested 7.01 13.00  
Weighted average grant date fair value per share, Forfeited $ 7.01    
Weighted average grant date fair value per share, RSUs outstanding Ending Balance   $ 7.01 $ 13.00