Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Detail)

v3.7.0.1
Stockholders' Equity (Detail)
Jun. 30, 2017
shares
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Options to purchase common stock 487,528
Shares reserved for issuance 21,528,369
Warrants  
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Shares reserved for issuance 11,615,849
2014 Stock Plan  
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Shares reserved for issuance 202,290
Series C Convertible Preferred Stock [Member]  
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Convertible preferred stock 3,335
Series D Convertible Preferred Stock [Member]  
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Convertible preferred stock 186,367
Series E Convertible Preferred Stock [Member]  
Shares Of Common Stock Reserved For Future Issuance [Line Items]  
Convertible preferred stock 9,033,000