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Notes Payable - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2015
Apr. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2010
Debt Instrument [Line Items]                
Amortization of financing costs and discounts       $ 636,000        
Notes payable     $ 1,000,000          
Promissory note agreed to convert     114,369          
Accrued interest paid     $ 39,000          
Notes payable and accounts payable, total       $ 950,000        
Warrant exercisable as a percentage of shares issued       300.00%        
Settlement agreement payment cash paid       $ 265,000        
Cash settlement exchange for retiring notes   $ 132,000            
Difference amount of notes payable and amount paid to retire   $ 133,000            
License agreement and miscellaneous other obligation             $ 23,000  
Debt instrument, increase, accrued interest       50,000        
Other creditors holding       50,000        
Other creditors outstanding principal     95,000          
Other creditors outstanding principal       29,000        
Accrued interest were repaid by cash       13,000        
2013 Securities Purchase Agreement                
Debt Instrument [Line Items]                
Notes payable       $ 1,000,000        
2013 Promissory Note                
Debt Instrument [Line Items]                
Convertible notes payable current $ 1,000,000              
Proceeds from issuance of preferred stock $ 1,000,000              
Percentage of accrued interest           5.00%    
Short term debt maturity date       Jun. 20, 2014        
Proceeds from security purchase agreement       $ 364,000        
2009 Convertible Notes                
Debt Instrument [Line Items]                
Convertible notes payable current       $ 426,000        
Percentage of accrued interest       24.00%       15.00%
Short term debt maturity date       Sep. 30, 2010        
Accrued interest outstanding             $ 396,000  
Outstanding convertible note payable         $ 0      
Debt and capital lease obligations       $ 194,000        
Conversion period       3 years        
Debt instrument, face amount       $ 20,000        
Debt instrument, increase, accrued interest       $ 29,000        
2009 Convertible Notes | CA Warrant                
Debt Instrument [Line Items]                
Warrant percentage       20.00%        
Stock price of warrants       $ 2.44        
Warrant expiration date       Sep. 30, 2019        
2009 Convertible Notes | PA Warrant                
Debt Instrument [Line Items]                
Warrant percentage       9.00%        
2009 Convertible Notes | 2013 Securities Purchase Agreement                
Debt Instrument [Line Items]                
Convertible notes payable current     426,000          
Accrued interest outstanding     $ 422,000          
Side Agreement Notes                
Debt Instrument [Line Items]                
Convertible notes payable current       $ 249,000        
Promissory note agreed to convert       192,341        
Series B Preferred Stock                
Debt Instrument [Line Items]                
Proceeds from security purchase agreement       $ 636,000        
Series B Preferred Stock | 2013 Promissory Note                
Debt Instrument [Line Items]                
Preferred stock shares issued 1,851              
Series C Preferred Stock                
Debt Instrument [Line Items]                
Promissory note agreed to convert     771,458          
Common Class A                
Debt Instrument [Line Items]                
Promissory note agreed to convert     192,865 230,859        
Conversion price of common stock       $ 2.44        
Exchanged warrants, in share       123,433        
Stock price of warrants       $ 2.44        
Warrant exchanged         3,052,608      
Common stock issued for placement agent commission       34,715        
Common stock exercise of warrants purchase of share   32,675            
Common stock exercise of warrants purchase price per share   $ 2.44            
Common Class A | 2013 Securities Purchase Agreement                
Debt Instrument [Line Items]                
Notes payable       $ 950,000        
Promissory note agreed to convert       389,437        
Diluted stock outstanding, percentage       10.00%        
Common Class A | 2009 Convertible Notes                
Debt Instrument [Line Items]                
Promissory note agreed to convert       20,205        
Conversion price of common stock       $ 2.44        
Exchanged warrants, in share     985,229          
Settlement agreement with conversion of common stock       $ 265,000        
Common stock conversion price       $ 2.44        
Financing closing cost       $ 1,200,000