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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, 2017
$ / shares
Dec. 31, 2014
$ / 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 [Member]        
Subsidiary, Sale of Stock [Line Items]        
Issued (in shares) 6,514,625 6,514,625    
Number of common shares purchased for each warrant 1      
Exercise price (in dollars per share) | $ / shares $ 1.92 $ 1.92 $ 1.92 $ 5.00
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 [Member] | Over-Allotment Option        
Subsidiary, Sale of Stock [Line Items]        
Issued (in shares) 333,375