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Warrants - Summary of Placement Warrants Valuation Using Black-Scholes Pricing Model (Detail)

v3.3.1.900
Warrants - Summary of Placement Warrants Valuation Using Black-Scholes Pricing Model (Detail) - Warrant [Member]
12 Months Ended
Dec. 31, 2014
Class of Warrant or Right [Line Items]  
Dividend yield 0.00%
Expected volatility 74.66%
Weighted average risk-free interest rate 1.61%
Expected term (years) 5 years