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Loss per share - Summary of Anti-dilutive Securities (Details) - shares | 12 Months Ended
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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

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