Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Schedule of Share Based Payment Assumptions (Details)

v3.8.0.1
Stock Based Compensation - Schedule of Share Based Payment Assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate, Minimum 1.89% 1.14% 1.34%
Risk-free interest rate, Maximum 2.37% 2.09% 1.74%
Dividend yield 0.00% 0.00% 0.00%
Expected life 6 years 6 years 6 years
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 67.80% 44.72% 71.10%
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Volatility 109.63% 89.15% 102.30%