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 6 Months Ended
Feb. 29, 2016
Jun. 30, 2016
Jun. 30, 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   $ 44,000 $ 3,000,000  
March 2012 Revalued Warrants [Member]        
Class Of Warrant Or Right [Line Items]        
Gain (loss) on revaluation of warrant liability   3,200,000 7,200,000  
Two Year Warrants Issued in December 2014 [Member]        
Class Of Warrant Or Right [Line Items]        
Estimated fair value of warrants   0 0 $ 3,000,000
Five Year Warrants Issued in March 2012 [Member]        
Class Of Warrant Or Right [Line Items]        
Estimated fair value of warrants   $ 300,000 $ 300,000 $ 7,500,000