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Warrant Liability - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Apr. 30, 2015
USD ($)
$ / shares
shares
Jul. 31, 2014
USD ($)
$ / shares
shares
Oct. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Nov. 30, 2009
USD ($)
$ / shares
$ / Institutions
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
USD ($)
shares
Dec. 31, 2011
USD ($)
$ / shares
$ / Stock_Unit
shares
Class of Warrant or Right [Line Items]                    
Number of securities callable by each warrant or right warrants           1        
Exercise price of warrants | $ / shares $ 0.85 $ 2.17 $ 1.80              
Proceeds from issuance of common stock and warrants | $ $ 25,000,000 $ 20,000,000 $ 17,300,000              
Number of shares issued upon warrants exercise 35,715,000 11,299,435 12,845,500              
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 0.75 0.85 0.5              
Number of securities callable by warrants             1,180,015      
Common Stock [Member] | Series A Warrants [Member]                    
Class of Warrant or Right [Line Items]                    
Exercise price of warrants | $ / shares $ 0.70                  
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  
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 each warrant or right warrants           1        
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  
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       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 $ 0.70         $ 0.52