Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Capital Structure - Summary of Common Stock Reserved for Future Issuance (Detail) - shares
Mar. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]    
Common Stock reserved for future issuance 26,242,224 31,906,521
Stock Options [Member]    
Class of Stock [Line Items]    
Common Stock reserved for future issuance 5,907,782 4,691,746
Warrants [Member]    
Class of Stock [Line Items]    
Common Stock reserved for future issuance 20,334,442 27,214,775