Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Summary of Common Stock Reserved for Future Issuance (Detail)

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Capital Structure - Summary of Common Stock Reserved for Future Issuance (Detail) - shares
Jun. 30, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Common Stock reserved for future issuance 26,309,857 31,906,521
Stock Options [Member]    
Class of Stock [Line Items]    
Common Stock reserved for future issuance 6,036,984 4,691,746
Warrants [Member]    
Class of Stock [Line Items]    
Common Stock reserved for future issuance 20,272,873 27,214,775