Stockholders' Equity (Detail)	Jun. 30, 2016 shares
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Options to purchase common stock	209,772
Shares reserved for issuance	4,832,822
Warrants
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Shares reserved for issuance	2,344,023
2014 Stock Plan
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Shares reserved for issuance	425,992
Series C Convertible Preferred Stock [Member]
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Convertible preferred stock	1,666,668
Series D Convertible Preferred Stock [Member]
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Convertible notes payable	186,367