Quarterly report pursuant to Section 13 or 15(d)

3. Stock-Based Compensation (Details)

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3. Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock-based Compensation Details        
Risk free interest rate, minimum 1.61% 1.77% 1.61% 1.77%
Risk free interest rate, maximum 1.97%   1.97%  
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected term, minimum 5 years 5 years 5 years 5 years
Expected term, maximum 10 years   10 years  
Expected volatility, minimum 41.20% 47.30% 41.20% 47.30%
Expected volatility, maximum 54.20%   54.20%