Quarterly report pursuant to Section 13 or 15(d)

Capital Stock, Stock Plans and Stock Based Compensation - Schedule of Stock Options Roll Forward (Details) (Parenthetical)

v3.19.1
Capital Stock, Stock Plans and Stock Based Compensation - Schedule of Stock Options Roll Forward (Details) (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Payment Arrangement [Abstract]    
Stock option exercise price per share lower limit $ 2.79 $ 2.79
Stock option exercise price per share upper limit $ 13.35 $ 13.35