Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Warrants - Summary of Derivative Warrant Activity (Detail)

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Fair Value of Warrants - Summary of Derivative Warrant Activity (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Class of Warrants Outstanding [Roll Forward]    
Fair value of warrants outstanding as of December 31, 2014 $ 52,000  
Change in fair value of warrant liability 196,000 $ (195,000)
Fair value of warrants outstanding as of June 30, 2015 248,000  
Consulting [Member]    
Class of Warrants Outstanding [Roll Forward]    
Fair value of warrants outstanding as of December 31, 2014 0  
Change in fair value of warrant liability 1,000  
Fair value of warrants outstanding as of June 30, 2015 1,000  
Financing [Member]    
Class of Warrants Outstanding [Roll Forward]    
Fair value of warrants outstanding as of December 31, 2014 44,000  
Change in fair value of warrant liability 161,000  
Fair value of warrants outstanding as of June 30, 2015 205,000  
Series B Preferred Stock [Member]    
Class of Warrants Outstanding [Roll Forward]    
Fair value of warrants outstanding as of December 31, 2014 8,000  
Change in fair value of warrant liability 34,000  
Fair value of warrants outstanding as of June 30, 2015 $ 42,000