Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details 2)

v3.19.3
Shareholders' Equity (Details 2) - $ / shares
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]    
Expected term, in years 5 years 9 months 18 days 5 years 8 months 12 days
Expected volatility 78.02% 68.12%
Risk-free interest rate 2.34% 2.76%
Dividend yield
Grant date fair value $ 2.64 $ 3.07