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Stockholders' Equity (Additional Information) (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 10, 2015
Mar. 18, 2015
Nov. 18, 2014
Apr. 10, 2015
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
May. 08, 2013
Class of Stock [Line Items]                  
Preferred stock, shares authorized         5,000,000 5,000,000   5,000,000  
Preferred stock, par value (usd per share)         $ 0.0001 $ 0.0001   $ 0.0001  
Common stock, shares authorized   3,653,846     275,000,000 275,000,000   200,000,000  
Common stock, par value (usd per share)         $ 0.0001 $ 0.0001   $ 0.0001  
Proceeds from Issuance or Sale of Equity   $ 38,000,000       $ 309,000 $ 263,000    
Purchase Agreement Term     36 months            
Share Price   $ 1.56              
Issuance of common stock, shares   24,358,974              
Number of Shares Per Unit   0.50              
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 2.08             $ 2.47
Number of shares availabe from warrants   1,826,923              
Stock Issued During Period, Shares, Overallotment Option 3,653,846 1,826,923              
Proceeds From Issuance or Sale of Equity, Net Underwriting Discounts, Commissions and Offering Expenses $ 5,400,000     $ 40,800,000          
Lincoln Park Capital, LLC [Member]                  
Class of Stock [Line Items]                  
Proceeds from Issuance or Sale of Equity     $ 4,900,000   $ 4,400,000        
Stock Issued During Period, Shares, Purchase of Assets     2,500,000            
Share Price     $ 2.00            
Issuance of common stock, shares         2,700,000        
Lincoln Park Capital, LLC [Member] | Common Stock [Member]                  
Class of Stock [Line Items]                  
Proceeds from Issuance or Sale of Equity     $ 50,000,000            
Issuance of common stock, shares     631,221            
MLV & Co. LLC and Maxim Group LLC [Member]                  
Class of Stock [Line Items]                  
Proceeds from Issuance or Sale of Equity         $ 2,300,000        
Issuance of common stock, shares         1,400,000        
At Market Issuance Sales Agreements, Percent of Gross Proceeds               3.00%  
At Market Issuance Sales Agreements, Maximum Gross Proceeds               $ 20,000,000