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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock-based Compensation Details      
Risk free interest rate, minimum 1.78% 1.61% 1.77%
Risk free interest rate, maximum 1.78% 1.97% 1.78%
Dividend yield 0.00% 0.00% 0.00%
Expected term, minimum 5 years 5 years 5 years
Expected term, maximum 5 years 10 years 5 years
Expected volatility, minimum 43.30% 41.20% 43.30%
Expected volatility, maximum 43.30% 54.20% 47.30%