Annual report pursuant to Section 13 and 15(d)

Capital Stock - Summary of Common Stock Warrants Outstanding (Details)

v3.3.1.900
Capital Stock - Summary of Common Stock Warrants Outstanding (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2012
Feb. 28, 2010
Class Of Warrant Or Right [Line Items]        
Warrant outstanding (in shares) 18,165,000 21,768,000    
Five Year Warrants Issued in February 2010 [Member]        
Class Of Warrant Or Right [Line Items]        
Exercise price of warrants (in dollars per share)       $ 10.50
Warrant outstanding (in shares)       1,260,000
Five Year Warrants Issued in February 2010 [Member] | Warrant Liabilities [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2010-02      
Expiration Date 2015-02      
Exercise price of warrants (in dollars per share) $ 10.50      
Warrant outstanding (in shares)   1,260,000    
Five Year Warrants Issued in December 2011 [Member] | Stockholders' Equity [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2011-12      
Expiration Date 2016-12      
Exercise price of warrants (in dollars per share) $ 1.14      
Warrant outstanding (in shares) 263,000 263,000    
Five Year Warrants Issued in March 2012 [Member]        
Class Of Warrant Or Right [Line Items]        
Exercise price of warrants (in dollars per share)     $ 1.76  
Warrant outstanding (in shares) 9,585,153 12,109,418 14,834,577  
Five Year Warrants Issued in March 2012 [Member] | Warrant Liabilities [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2012-03      
Expiration Date 2017-03      
Exercise price of warrants (in dollars per share) $ 1.76      
Warrant outstanding (in shares) 9,585,000 12,109,000    
Five Year Warrants Issued in September 2012 [Member] | Stockholders' Equity [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2012-09      
Expiration Date 2017-09      
Exercise price of warrants (in dollars per share) $ 3.54      
Warrant outstanding (in shares) 39,000 39,000    
Two Year Warrants Issued in December 2014 [Member]        
Class Of Warrant Or Right [Line Items]        
Exercise price of warrants (in dollars per share)   $ 7.90    
Warrant outstanding (in shares) 8,097,165 8,097,165    
Two Year Warrants Issued in December 2014 [Member] | Warrant Liabilities [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2014-12      
Expiration Date 2016-12      
Exercise price of warrants (in dollars per share) $ 7.90      
Warrant outstanding (in shares) 8,097,000 8,097,000    
Five Year Warrants Issued in February 2015 [Member] | Stockholders' Equity [Member]        
Class Of Warrant Or Right [Line Items]        
Issuance Date 2015-02      
Expiration Date 2020-02      
Exercise price of warrants (in dollars per share) $ 3.31      
Warrant outstanding (in shares) 181,000