XML 29 R52.htm IDEA: XBRL DOCUMENT v3.2.0.727
Warrants - Calculation of Fair Value Assumptions Using Black Scholes Option Model (Detail) - Jun. 30, 2015 - Hercules Warrants [Member] - $ / shares
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise price $ 8.35
Fair value of underlying stock $ 11.80
Expected volatility 72.52%
Contractual term 5 years
Risk-free interest rate 1.68%
Expected dividend yield 0.00%