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Share Capital - Share-based Payment Arrangement, Option, Activity (Detail) - 9 months ended Sep. 30, 2020
USD ($)
yr
shares
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Balance | shares 3,839,017  
Number of Share, Granted | shares 2,496,511  
Number of Shares, Exercised | shares (65,443)  
Number of Shares, Forfeited | shares (487,486)  
Number of Share, Vested | shares 1,635,030  
Number of Shares, Ending Balance | shares 5,782,599  
Number of Share, Exercisable | shares   1,516,872
Weighted Average Exercise Price, Balance | $ / shares   $ 13.21
Weighted Average Exercise Price, Granted | $ / shares   9.76
Weighted Average Exercise Price, Exercised | $ / shares   11.02
Weighted Average Exercise Price, Forfeited | $ / shares   13.82
Weighted Average Exercise Price, Vested | $ / shares   13.36
Weighted Average Exercise Price, Ending Balance | $ / shares   11.69
Weighted Average Exercise Price, Exercisable | $ / shares   $ 13.22
Weighted Average Contractual Life, Balance | yr 5.81  
Weighted Average Contractual Life Granted 5 years  
Weighted Average Contractual Life Exercised 3 years 11 months 23 days  
Weighted Average Contractual Life Forfeited 5 years 2 months 19 days  
Weighted Average Contractual Life, Vested 6 years 7 months 24 days  
Weighted Average Contractual Life, Ending Balance | yr 5.53  
Weighted Average Contractual Life, Exercisable 6 years 8 months 23 days  
Aggregate Intrinsic Value, Balance | $ $ 218,234  
Aggregate Intrinsic Value, Exercised | $ $ 4,601,129