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Share Capital - Narrative (Details)
3 Months Ended 6 Months Ended
May 19, 2016
shares
Mar. 25, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
CAD / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock issued during underwritten public offering (in shares) | shares   7,500,000          
Stock price at public offering (in USD per share) | $ / shares   $ 20.25          
Gross proceeds from issuance of stock   $ 151,875,000 $ 0 $ 2,000 $ 0 $ 142,177,000  
Period for option to purchase additional shares   30 days          
Options granted (in shares) | shares   1,125,000          
Potential proceeds of additional shares authorized   $ 22,781,000          
Payments of stock issuance costs, including commissions and professional fees   9,700,000          
Proceeds from issuance of stock, net   $ 142,175,000          
Increase in number of stock-based compensation awards authorized (in shares) | shares 5,000,000            
Remaining contractual life of exercisable liability options         5 years 7 months    
Aggregate intrinsic value of liability options exercisable     $ 288,000   $ 288,000    
Remaining contractual life of exercisable liability options expected to vest         7 years 6 months    
Weighted average exercise price, exercisable liability options expected to vest | (per share)     $ 8.87   $ 8.87   CAD 11.46
Fair value of vested liability options         $ 161,000    
Range 7              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of options exercisable (in shares) | shares     633,854   633,854    
Weighted average exercise price, exercisable liability options | (per share)     $ 5.33   $ 5.33   CAD 6.88