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Common Shares (Public Offering) (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 31, 2016
USD ($)
item
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
Dec. 31, 2013
$ / shares
Subsidiary, Sale of Stock [Line Items]        
Number of units issued 12,362,500      
Proceeds from issuance of common shares | $ $ 15,883 $ 15,883    
Number of common shares in each unit | item 1      
Number of common shares to purchase each warrant 0.50      
Over-Allotment Option        
Subsidiary, Sale of Stock [Line Items]        
Number of units issued 1,612,500      
Warrants        
Subsidiary, Sale of Stock [Line Items]        
Number of common shares purchased for each warrant 1      
Issued (in shares) 6,514,625 6,514,625    
Exercise price (in dollars per share) | $ / shares $ 1.92 $ 1.92 $ 5.00 $ 4.63
Period warrants are exercisable 36 months      
Fair value of warrants | $ $ 3,320      
Expected volatility (as a percent)   89.00%    
Risk-free interest rate (as a percent)   0.86%    
Expected term (in years)   3 years    
Share price (in dollars per share) | $ / shares $ 1.13      
Warrants | Over-Allotment Option        
Subsidiary, Sale of Stock [Line Items]        
Issued (in shares) 333,375