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Share Capital - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Number of Stock Options Outstanding, Outstanding at Beginning Balance 2,614,916 1,167,693
Number of Stock Options Outstanding, Granted 4,081,357 1,447,223
Number of Stock Options Outstanding, Exercised (471,794)
Number of Stock Options Outstanding, Cancelled
Number of Stock Options Outstanding, Outstanding at Ending Balance 6,224,479 2,614,916
Number of Stock Options Outstanding, Vested and expected-to-vest at end of period 2,143,122 2,614,916
Weighted Average Exercise Price, Outstanding at Beginning Balance $ 0.13 $ 0.28
Weighted Average Exercise Price, Granted 1.1 [1]
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Cancelled
Weighted Average Exercise Price, Outstanding at Ending Balance 0.78 0.13
Weighted Average Exercise Price, Vested and expected-to-vest at end of period $ 0.13 $ 0.13
Aggregate intrinsic value, Stock Options Outstanding at Beginning period $ 15,624  
Aggregate intrinsic value, Stock Options Outstanding at End period 1,859 $ 15,624
Aggregate intrinsic value, Vested and expected-to-vest at end of period $ 1,375 $ 15,624
[1] Less than 1