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Redeemable Convertible Preferred Stock - Preferred Stock and Warrants Calculated Using the Black Scholes Merton Pricing Model (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013
Preferred stock and warrants calculated using the Black Scholes Merton pricing model |
Number of warrants | 325,000
Expiration date | May 02, 2020
Warrant |
Preferred stock and warrants calculated using the Black Scholes Merton pricing model |
Exercise price | $ 6.62
Expected volatility of underlying stock | 74.00%
Risk-free interest rate | 1.62%
Dividend yield | 0.00%
Expected life of warrants | 8 years
Weighted-average fair value of warrants | $ 3.11

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