Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENT OF CHANGESIN SHAREHOLDERS??? EQUITY (Parenthetical)

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CONSOLIDATED STATEMENT OF CHANGESIN SHAREHOLDERS’ EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Exercise of stock options, shares tendered in payment of exercise price (in shares) 19,658 846,789 196,518
Shares paid for tax withholding for share-based compensation 218,587 901,691  
Shares surrendered for tax withholding   $ 2,038  
Preferred Stock      
Underwriting discount and expenses $ 958 $ 723 $ 1,972
Option      
Exercise of stock options, shares tendered in payment of exercise price (in shares) 1,715,019 1,129,195  
Warrant      
Exercise of stock options, shares tendered in payment of exercise price (in shares)   846,789 196,518