Annual report pursuant to Section 13 and 15(d)

Stock Options - Summary of Non-Vested Stock Options (Details)

v3.19.1
Stock Options - Summary of Non-Vested Stock Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Shares Non-vested , Beginning balance 3,329,989 3,826,274
Shares, Granted 2,378,500 1,681,500
Shares, Vested (1,643,772) (2,003,806)
Shares, Forfeited (438,428) (173,979)
Shares Outstanding, Ending balance 3,626,289 3,329,989
Weighted Average Fair Value Non Vested, Beginning Balance $ 4.61 $ 2.86
Weighted Average Fair Value, Granted 5.63 6.22
Weighted Average Fair Value, Vested 3.98 2.60
Weighted Average Fair Value, Forfeited 5.91 5.03
Weighted Average Fair Value Non Vested, Ending Balance $ 5.32 $ 4.61