Quarterly report pursuant to Section 13 or 15(d)

Common Stock Warrants - Additional Information (Details)

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Common Stock Warrants - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended
Feb. 29, 2016
Mar. 31, 2016
Dec. 31, 2015
Class Of Warrant Or Right [Line Items]      
Aggregate number of unregistered shares of common stock called by warrants (in shares) 165,000    
Exercise price of warrants (in dollars per share) $ 0.77    
Exercisable period of warrants 5 years    
Warrants expiration period 2021-02    
Estimated fair value of warrants $ 100,000    
December 2014 Revalued Warrants [Member]      
Class Of Warrant Or Right [Line Items]      
Gain (loss) on revaluation of warrant liability   $ 2,900,000  
March 2012 Revalued Warrants [Member]      
Class Of Warrant Or Right [Line Items]      
Gain (loss) on revaluation of warrant liability   4,000,000  
Two Year Warrants Issued in December 2014 [Member]      
Class Of Warrant Or Right [Line Items]      
Estimated fair value of warrants   44,000 $ 3,000,000
Five Year Warrants Issued in March 2012 [Member]      
Class Of Warrant Or Right [Line Items]      
Estimated fair value of warrants   $ 3,500,000 $ 7,500,000