Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Reserved Shares of Authorized but Unissued Common Stock (Detail)

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Stockholders' Equity - Reserved Shares of Authorized but Unissued Common Stock (Detail) - shares
Sep. 30, 2015
Dec. 31, 2014
Class of Stock [Line Items]    
Total reserved shares of common stock 3,951,819 3,317,963
Common stock warrants [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 1,667,398 1,768,347
Equity incentive plans [Member]    
Class of Stock [Line Items]    
Total reserved shares of common stock 2,284,421 1,549,616