Annual report pursuant to Section 13 and 15(d)

Stock Option Plans - Schedule of Options Activity (Details)

v3.20.1
Stock Option Plans - Schedule of Options Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
2015 Equity Incentive Plan [Member]      
Beginning balance, Options, Outstanding options 5,525,405 5,112,967 4,443,000
Options, Granted, fair value 1,490,490 1,497,300 1,077,000
Options, Exercised (303,129) (360,853) (81,719)
Options, Expired/forfeited (917,371) (724,009) (325,314)
Ending balance, Options, Outstanding options 5,795,395 5,525,405 5,112,967
Options, Non-vested options 2,342,706 2,355,719 2,641,832
Beginning balance, Weighted- average exercise price, Outstanding options $ 8.08 $ 9.07 $ 4.94
Weighted- average exercise price, Granted, fair value 6.53 12.95 14.31
Weighted- average exercise price, Exercised 3.20 6.22 4.22
Weighted- average exercise price, Expired/forfeited 7.95 10.65 5.52
Ending balance, Options, Outstanding options 7.96 8.08 9.07
Weighted- average exercise price, Non-vested options $ 8.78 $ 10.41 $ 8.21
2005 Equity Incentive Plan [Member]      
Beginning balance, Options, Outstanding options 316,400 316,760 328,560
Options, Expired/forfeited (56,400) (360) (11,800)
Ending balance, Options, Outstanding options 260,000 316,400 316,760
Beginning balance, Weighted- average exercise price, Outstanding options $ 14.15 $ 14.31 $ 14.57
Weighted- average exercise price, Expired/forfeited 19.75 150.00 21.53
Ending balance, Options, Outstanding options $ 12.94 $ 14.15 $ 14.31