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Share Capital - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Equity [Abstract]    
Number of Stock Options Outstanding, Outstanding at Beginning Balance [1] 414,965 174,328
Number of Stock Options Outstanding, Granted 10,000 272,090 [1]
Number of Stock Options Outstanding, Exercised (2,487) (31,453) [1]
Number of Stock Options Outstanding, Cancelled [1]
Number of Stock Options Outstanding, Outstanding at Ending Balance 422,478 414,965 [1]
Number of Stock Options Outstanding, Vested and expected-to-vest at end of period 228,758 142,875 [1]
Weighted Average Exercise Price, Outstanding at Beginning Balance [1] $ 11.70 $ 1.95
Weighted Average Exercise Price, Granted 9 16.50 [1]
Weighted Average Exercise Price, Exercised [1]
Weighted Average Exercise Price, Cancelled [1]
Weighted Average Exercise Price, Outstanding at Ending Balance 11.70 11.70 [1]
Weighted Average Exercise Price, Vested and expected-to-vest at end of period $ 7.80 $ 1.95 [1]
Aggregate intrinsic value, Stock Options Outstanding at Beginning period [1] $ 1,859 $ 3,739
Aggregate intrinsic value, Stock Options Outstanding at End period 729 1,859 [1]
Aggregate intrinsic value, Vested and expected-to-vest at end of period $ 729 $ 1,375 [1]
[1] December 31, 2017 share data represents the number of shares adjusted to retroactively reflect the 1:15 reverse stock split effected on September 4, 2018.