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Stockholders' Equity - Summary Of Assumptions Used To Value Stock Option Grants Using Lattice-Binomial Model (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]        
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility, minimum     45.00% 53.00%
Expected volatility 45.00% 53.00%    
Expected volatility, maximum     48.00% 54.00%
Risk free interest rate, minimum     2.66% 1.87%
Risk-free interest rate 2.66% 1.88%    
Risk free interest rate, maximum     2.83% 1.88%
Suboptimal exercise factor, minimum 2.66 2.39 2.66 2.33
Suboptimal exercise factor, maximum 4.20 3.61 4.20 3.61