Shares of Common Stock Reserved for Future Issuance (Detail)	Jun. 30, 2014
Shares Of Common Stock Reserved For Future Issuance [Line Items]
Convertible notes payable	1,508,162
Options to purchase common stock	2,211,018
Options available for future issuance	1,057,211
Warrants	824,648
Total	11,979,614
Series A Convertible Preferred Stock [Member]
Shares Of Common Stock Reserved For Future Issuance [Line Items]
convertible preferred stock	5,821,699
Series B Convertible Preferred Stock [Member]
Shares Of Common Stock Reserved For Future Issuance [Line Items]
convertible preferred stock	556,876