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Stockholders' Equity - Common Stock Reserved for Future Issuance (Detail)
Jun. 30, 2015
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 11,116,595
Warrants [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 1,102,375
Stock options [Member] | Equity Incentive Plan 2008 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 622,192
Stock options [Member] | Equity Incentive Plan 2012 [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Common stock reserved for future issuance 9,392,028