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3. Stock-Based Compensation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-based Compensation Details        
Risk free interest rate 1.87% 0.00% 1.87%  
Risk free interest rate, minimum       0.70%
Risk free interest rate, maximum       1.73%
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected term 5 years   5 years  
Expected term, minimum       2 years
Expected term, maximum       10 years
Expected volatility 44.60% 0.00% 44.60%  
Expected volatility, minimum       34.90%
Expected volatility, maximum       50.40%