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3. Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock-based Compensation Details        
Risk free interest rate, minimum 0.00% 0.70% 0.00% 0.70%
Risk free interest rate, maximum 0.00% 1.73% 0.00% 1.73%
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected term, minimum   2 years   2 years
Expected term, maximum   10 years   10 years
Expected volatility, minimum 0.00% 35.90% 0.00% 34.90%
Expected volatility, maximum 0.00% 50.40% 0.00% 50.40%