XML 78 R57.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock Based Compensation (Assumptions for Option Grants Issued) (Detail)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Risk free interest rate 1.67% 2.01% 1.57%
Volatility 73.97% 79.37% 77.98%
Expected lives (years) 6 years 1 month 28 days 6 years 1 month 28 days 6 years 3 months
Expected dividend yield 0.00% 0.00% 0.00%