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Share Capital - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]      
Number of Stock Options Outstanding, Outstanding at Beginning Balance [1],[2] 414,965 174,328 77,846
Number of Stock Options Outstanding, Granted [2] 272,090 [1] 96,482 [1]
Number of Stock Options Outstanding, Exercised [2] (2,487) (31,453) [1] [1]
Number of Stock Options Outstanding, Cancelled [2] [1] [1]
Number of Stock Options Outstanding, Outstanding at Ending Balance [2] 412,478 414,965 [1] 174,328 [1]
Number of Stock Options Outstanding, Vested and expected-to-vest at end of period [2] 205,024 142,875 [1] 174,328 [1]
Weighted Average Exercise Price, Outstanding at Beginning Balance [2] $ 11.7 $ 1.95 [1] $ 4.2 [1]
Weighted Average Exercise Price, Granted [2] 16.5 [1] [1],[3]
Weighted Average Exercise Price, Exercised [2] [1] [1]
Weighted Average Exercise Price, Cancelled [2] [1] [1]
Weighted Average Exercise Price, Outstanding at Ending Balance [2] 11.7 11.7 1.95 [1]
Weighted Average Exercise Price, Vested and expected-to-vest at end of period [2] $ 6.9 $ 1.95 [1] $ 1.95 [1]
Aggregate intrinsic value, Stock Options Outstanding at Beginning period [2] $ 1,859 $ 3,739 [1]  
Aggregate intrinsic value, Stock Options Outstanding at End period [2] 1,259 1,859 $ 3,739 [1]
Aggregate intrinsic value, Vested and expected-to-vest at end of period [2] $ 1,248 $ 1,375 [1] $ 15,624 [1]
[1] December 31 2017 and 2016 options data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018.
[2] Share data represents the number of shares adjusted to retroactively reflect the 1:15 Reverse Split effected on September 4, 2018.
[3] Less than 1