Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details 2)

v3.19.1
Shareholders' Equity (Details 2) - $ / shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Expected term, in years 5 years 9 months 18 days 5 years 8 months 12 days
Expected volatility 70.57% 67.04%
Risk-free interest rate 2.56% 2.63%
Dividend yield
Grant date fair value $ 2.73 $ 2.79