Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Fair Value Valuation Assumptions) (Details)

v2.4.0.8
Basis of Presentation (Fair Value Valuation Assumptions) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Summary of fair-value options awarded to employees and directors        
Risk-free interest rate 1.90% 1.80% 1.90% 1.40%
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility 67.00% 70.00% 68.00% 70.00%
Expected term 6 years 5 months 5 days 6 years 3 months 18 days 6 years 5 months 5 days 6 years 3 months 18 days
Forfeiture rate 8.60% 8.80%    
Minimum
       
Summary of fair-value options awarded to employees and directors        
Forfeiture rate     8.60% 8.40%
Maximum
       
Summary of fair-value options awarded to employees and directors        
Forfeiture rate     9.70% 9.80%