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Share Capital and Equity - Summary of Share Capital (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of classes of share capital [abstract]    
Beginning balance, shares 42,242,612 38,882,945
Shares issued pursuant to public offering, net 3,097,200 2,500,000
Shares issued pursuant to private placement, net 1,886,793  
Shares issued from vesting of RSUs 50,334 768,000
Shares issued on exercise of options 365,732 91,667
Ending balance, Shares 47,642,671 42,242,612
Beginning balance $ 81,043 $ 67,387
Shares issued pursuant to public offering, net 15,737 9,769
Shares issued pursuant to private placement, net 7,755  
Shares issued from vesting of RSUs 831 1,333
Shares issued on exercise of options 283 59
Ending balance $ 100,696 $ 81,043