Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions (Details)

v3.19.1
Stock-Based Compensation - Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]    
Risk-free interest rate 2.51% 2.65%
Expected life 6 years 6 years
Expected volatility 127.81% 126.93%
Dividend yield 0.00% 0.00%