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Loss per share - Summary of Anti-dilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Options      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 9,041,288 12,153,772 12,243,526
Restricted Stock Units      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 1,320,193 638,350 100,383
Restricted Stock Awards      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 0 41,280 61,880
Other Contingently Issuable Shares      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 156,190 162,320 0
Warrants      
Earnings per share [line items]      
Antidilutive securities excluded from computation of earnings per share (in shares) 800,000 2,400,000 0