Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Significant Accounting Policies (Details 2)

v3.19.1
Significant Accounting Policies (Details 2)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Dividend yield 0.00%    
Expected volatility 60.00%    
Expected life (in years)   7 years 2 years 11 months 23 days
Minimum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Expected volatility   64.00% 68.00%
Risk-free interest 2.15% 1.78% 0.83%
Expected life (in years) 3 years 6 months    
Maximum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Expected volatility   70.00% 71.00%
Risk-free interest 2.91% 2.28% 0.97%
Expected life (in years) 4 years 4 months 13 days