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Loss per share - Summary of Anti-dilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee options      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 8,695,348 9,041,288 12,153,772
Restricted stock units      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 1,425,196 1,320,193 638,350
Restricted stock awards      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 0 0 41,280
Other contingently issuable shares      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 108,720 156,190 162,320
Warrants      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 800,000 800,000 2,400,000