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Shareholders' Equity, Warrants (Details) - $ / shares
 3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Class of Warrant or Right [Line Items]    
Term of warrants from date of issuance 7 years  
Expiry date of warrants Feb. 14, 2018  
Series A Warrants [Member]    
Class of Warrant or Right [Line Items]    
Cash receivable per share under warrant (in dollars per share) $ 12.50  
Exercise price of warrants (in dollars per share) $ 51.21  
Warrants outstanding (in shares) 237,977 239,306
Series A Warrants [Member] | Class A [Member]    
Class of Warrant or Right [Line Items]    
Number of shares warrants are entitled to purchase (in shares) 6.02  
Series B Warrants [Member]    
Class of Warrant or Right [Line Items]    
Cash receivable per share under warrant (in dollars per share) $ 12.50  
Exercise price of warrants (in dollars per share) $ 56.51  
Warrants outstanding (in shares) 322,110 323,915
Series B Warrants [Member] | Class A [Member]    
Class of Warrant or Right [Line Items]    
Number of shares warrants are entitled to purchase (in shares) 6.03