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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Share capital [Member]
Additional paid-in capital [Member]
Treasury stock, at cost [Member]
Accumulated other comprehensive income (loss) [Member]
Retained earnings [Member]
Total
Balance at Dec. 31, 2013 $ 611 $ 262,809 $ (25,984) $ 1,733 $ 54,951 $ 294,120
Balance, shares at Dec. 31, 2013 44,733,589          
Repurchase of ordinary shares (15,169) (15,169)
Repurchase of ordinary shares, shares (887,855)          
Issuance of shares upon exercise of stock options $ 43 22,450 22,493
Issuance of shares upon exercise of stock options, shares 3,080,763          
Stock based compensation 7,382 7,382
Tax deficiency related to exercise of stock options 1,443 1,443
Other comprehensive income (loss), net of tax (1,522) (1,522)
Net loss 24,950 24,950
Balance at Dec. 31, 2014 $ 654 294,084 (41,153) 211 79,901 $ 333,697
Balance, shares at Dec. 31, 2014 46,926,497         46,926,497
Repurchase of ordinary shares (52,896) $ (52,896)
Repurchase of ordinary shares, shares (2,824,772)          
Issuance of shares upon exercise of stock options $ 7 8,739 8,746
Issuance of shares upon exercise of stock options, shares 677,122          
Stock based compensation 9,329 9,329
Tax deficiency related to exercise of stock options 632 632
Other comprehensive income (loss), net of tax 1,046 1,046
Net loss 18,569 18,569
Balance at Dec. 31, 2015 $ 661 312,784 (94,049) 1,257 98,470 $ 319,123
Balance, shares at Dec. 31, 2015 44,778,847         44,778,847
Repurchase of ordinary shares (21,980) $ (21,980)
Repurchase of ordinary shares, shares (1,884,030)          
Issuance of shares upon exercise of stock options $ 2 1,581 1,583
Issuance of shares upon exercise of stock options, shares 294,033          
Stock based compensation 11,520 11,520
Tax deficiency related to exercise of stock options (547) (547)
Other comprehensive income (loss), net of tax (1,277) (1,277)
Net loss (8,659) (8,659)
Balance at Dec. 31, 2016 $ 663 $ 325,338 $ (116,029) $ (20) $ 89,811 $ 299,763
Balance, shares at Dec. 31, 2016 43,188,850         43,188,850