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Warrant Liability - Additional Information (Detail)
 1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2011
$ / shares
shares
Nov. 30, 2009
USD ($)
$ / shares
$ / Institutions
shares
Jun. 30, 2012
shares
Sep. 30, 2015
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
USD ($)
shares
Dec. 31, 2011
USD ($)
$ / shares
$ / Stock_Unit
shares
Apr. 30, 2015
$ / shares
Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Proceeds from sale of stock | $         $ 1,652,000 $ 538,000 $ 3,078,000    
Common Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
November 2009 Financing [Member]                  
Class of Warrant or Right [Line Items]                  
Number of units sold to investors   1,000,000              
Price per unit | $ / shares   $ 12.50              
Gross proceeds from units sold to investors | $   $ 12,500,000              
Proceeds from sale of stock | $   $ 11,985,000              
Warrant expiration period       2009-11          
November 2009 Financing [Member] | Common Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants   0.40              
Exercise price of warrants | $ / shares   $ 15.00              
Number of securities callable by warrants   400,000              
Number of warrants in each unit sold to institutional investors | $ / Institutions   1              
December 2011 Financing [Member]                  
Class of Warrant or Right [Line Items]                  
Price per unit | $ / shares               $ 1.25  
Proceeds from issuance of common stock and warrants | $               $ 10,000,000  
Number of Series A warrants in each unit issued in public offering | $ / Stock_Unit               1  
December 2011 Financing [Member] | Series B Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Exercise price of warrants | $ / shares $ 1.25             $ 1.25  
Number of securities callable by warrants 8,000,000             8,000,000  
Term of warrant 90 days             90 days  
Warrant expiration date       May 02, 2012          
Number of warrants exercised     2,700,000       2,700,000    
Number of warrants expired     5,300,000 5,300,000          
December 2011 Financing [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by warrants 8,000,000             8,000,000  
Term of warrant 5 years                
Number of warrants exercised         1,180,015 384,534 2,198,571    
Number of warrants issued upon Series B warrants exercise     2,700,000       2,700,000    
December 2011 Financing [Member] | Common Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants 1             1  
Number of shares issued upon warrants exercise     2,700,000            
December 2011 Financing [Member] | Common Stock [Member] | Series B Warrant [Member]                  
Class of Warrant or Right [Line Items]                  
Number of shares issued upon warrants exercise             2,700,000    
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Exercise price of warrants | $ / shares $ 1.40             $ 1.40  
Number of shares issued upon warrants exercise         1,180,015 384,534 2,198,571    
December 2011 Financing [Member] | Capital Units [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by warrants 8,000,000             8,000,000  
December 2011 Financing [Member] | Capital Units [Member] | Series B Warrant [Member]                  
Class of Warrant or Right [Line Items]                  
Warrant expiration period       2016-12          
December 2011 Financing [Member] | Capital Units [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants 1             1  
April 2015 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Exercise price of warrants | $ / shares                 $ 0.6999999