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Share-Based Payments - Restricted Share Units (Details) - Restricted Share Units ("RSUs") - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restricted Stock Units      
Number of shares outstanding 239,384 105,169 137,210
Granted 769,132 244,832 47,900
Vested and issued (90,330) (52,640) (65,758)
Forfeited (128,448) (57,977) (14,183)
Number of shares outstanding 789,738 239,384 105,169
Weighted average grant date fair value per share      
Weighted average grant date fair value per share at the beginning $ 11.60 $ 28.50 $ 33.34
Granted 2.02 10.99 19.00
Vested and issued 12.04 31.15 31.80
Forfeited 6.93 21.74 27.87
Weighted average grant date fair value per share at the end $ 2.92 $ 11.60 $ 28.50
Additional disclosures      
Total unrecognized compensation related to unvested RSUs $ 1.1    
Recognition period 1 year 8 months 12 days    
Fair Value $ 0.2 $ 0.4 $ 1.5