Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock Options, Stock Purchase Plan and Warrants - Valuation of Option Items under Trinomial Lattice Model (Detail)

v3.3.1.900
Stock Options, Stock Purchase Plan and Warrants - Valuation of Option Items under Trinomial Lattice Model (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]      
Risk-free interest rate (%) 1.20% 1.00% 0.70%
Weighted average expected volatility (%) 51.00% 50.00% 46.00%
Dividend yield (%) 0.00% 0.00% 0.00%
Warrant [Member]      
Deferred Compensation Arrangement With Individual Excluding Share Based Payments And Postretirement Benefits [Line Items]      
Expected term in years 2 years 3 months 18 days    
Risk-free interest rate (%) 0.50%    
Weighted average expected volatility (%) 51.80%    
Dividend yield (%) 0.00%