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3. Stock-Based Compensation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
[1]
Sep. 30, 2015
[1]
Sep. 30, 2016
Sep. 30, 2015
Stock-based Compensation Details        
Risk free interest rate, minimum 0.70% 1.61%
Risk free interest rate, maximum 1.73% 1.97%
Dividend yield 0.00% 0.00%
Expected term, minimum 0 years 0 years 2 years 5 years
Expected term, maximum 0 years 0 years 10 years 10 years
Expected volatility, minimum 34.90% 41.20%
Expected volatility, maximum 50.40% 54.20%
[1] n/a