Long-term Debt - Summary of Estimated Fair Values of Outstanding Warrants Using Black-Scholes Option-Pricing Model (Detail) - Hercules Warrants [Member] |
Feb. 04, 2014
$ / shares
|
|---|---|
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | |
| Stock price | $ 32.66 |
| Expected option term (in years) | 3 years |
| Expected volatility | 62.00% |
| Risk-free interest rate | 0.70% |
| Expected dividend yield | 0.00% |