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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Additional paid-in Capital [Member]
Treasury shares at cost [Member]
Accumulated other comprehensive loss [Member]
Accumulated deficit [Member]
Total
Balance at Dec. 31, 2017 $ 214 $ 410,817 $ (20,091) $ (7,171) $ (249,871) $ 133,898
Balance, shares at Dec. 31, 2017 78,045,192          
Cumulative effect of the new revenue recognition standard         70 70
Exercise of options and vesting of RSU's [1] 2,611       2,611
Exercise of options and vesting of RSU's, shares 2,044,466          
Share-based compensation expense   1,980       1,980
Other comprehensive income (loss), net       (2,037)   (2,037)
Net income (loss)         23,046 23,046
Balance at Dec. 31, 2018 $ 214 415,408 (20,091) (9,208) (226,755) 159,568
Balance, shares at Dec. 31, 2018 80,089,658          
Exercise of options and vesting of RSU's $ 1 601       602
Exercise of options and vesting of RSU's, shares 573,147          
Share-based compensation expense   2,053       2,053
Other comprehensive income (loss), net       542   542
Net income (loss)         (2,344) (2,344)
Balance at Dec. 31, 2019 $ 215 418,062 (20,091) (8,666) (229,099) $ 160,421
Balance, shares at Dec. 31, 2019 80,662,805         80,662,805
Cumulative effect of adoption of ASU Topic 326         (700) $ (700)
Exercise of options and vesting of RSU's $ 3 1,234       1,237
Exercise of options and vesting of RSU's, shares 1,040,561          
Share-based compensation expense   1,662       1,662
Other comprehensive income (loss), net       598   598
Net income (loss)         (17,092) (17,092)
Balance at Dec. 31, 2020 $ 218 $ 420,958 $ (20,091) $ (8,068) $ (246,891) $ 146,126
Balance, shares at Dec. 31, 2020 81,703,366         81,703,366
[1] Represent an amount lower than $1