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Stockholders' Equity - Common Stock Warrants (Detail) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Class of Warrant or Right [Line Items]    
Common stock warrants, Exercise price per share   $ 0.33
July 18, 2018 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 259,907  
Common stock warrants, Exercise price per share $ 0.33  
Common stock warrants, Expiration Date Jul. 18, 2018  
January 16, 2019 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 301,986  
Common stock warrants, Exercise price per share $ 0.33  
Common stock warrants, Expiration Date Jan. 16, 2019  
December 9, 2015 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 11,908  
Common stock warrants, Exercise price per share $ 0.33  
Common stock warrants, Expiration Date Dec. 09, 2015  
January 30, 2019 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 15,250  
Common stock warrants, Exercise price per share $ 0.33  
Common stock warrants, Expiration Date Jan. 30, 2019  
October 13, 2016 [Member]    
Class of Warrant or Right [Line Items]    
Common stock warrants 1,544  
Common stock warrants, Exercise price per share $ 25.92  
Common stock warrants, Expiration Date Oct. 13, 2016