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STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Ordinary shares [Member] | Additional paid-in capital [Member] | Accumulated other comprehensive Income [Member] | Accumulated deficit [Member] | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 137 |  | $ 324,053 | $ 1,222 | $ (219,296) | $ 106,116
Balance, shares at Dec. 31, 2014 | 50,254,492 |  |  |  |  |
Options exercised | $ 1 |  | 971 |  |  | 972
Options exercised, shares | 317,752 |  |  |  |  |
Stock-based compensation relating to options issued to non-employees |  |  | 299 |  |  | 299
Stock-based compensation relating to options issued to employees and directors |  |  | 3,474 |  |  | 3,474
Changes in other comprehensive income from marketable securities |  |  |  | (641) |  | (641)
Changes in other comprehensive income from foreign currency derivative contracts |  |  |  | (160) |  | (160)
Net loss |  |  |  |  | (20,163) | (20,163)
Balance at Dec. 31, 2015 | $ 138 |  | 328,797 | 421 | (239,459) | 89,897
Balance, shares at Dec. 31, 2015 | 50,572,244 |  |  |  |  |
Options exercised | $ 2 |  | 2,456 |  |  | 2,458
Options exercised, shares | 559,290 |  |  |  |  |
Stock-based compensation relating to options issued to non-employees |  |  | 152 |  |  | 152
Stock-based compensation relating to options issued to employees and directors |  |  | 2,932 |  |  | 2,932
Changes in other comprehensive income from marketable securities |  |  |  | (440) |  | (440)
Changes in other comprehensive income from foreign currency derivative contracts |  |  |  | 26 |  | 26
Net loss |  |  |  |  | (31,506) | (31,506)
Balance at Dec. 31, 2016 | $ 140 |  | 334,337 | 7 | (270,965) | $ 63,519
Balance, shares at Dec. 31, 2016 | 51,131,534 |  |  |  |  | 51,131,534
Options exercised |  | [1] | 201 |  |  | $ 201
Options exercised, shares | 161,536 |  |  |  |  |
Stock-based compensation relating to options issued to non-employees |  |  | 23 |  |  | 23
Stock-based compensation relating to options issued to employees and directors |  |  | 2,610 |  |  | 2,610
Changes in other comprehensive income from foreign currency derivative contracts |  |  |  | 10 |  | 10
Cumulative effect adjustment from adoption of ASU 2016-09, Note 2x |  |  | 211 |  | (211) |
Net loss |  |  |  |  | (37,066) | (37,066)
Balance at Dec. 31, 2017 | $ 140 |  | $ 337,382 | $ 17 | $ (308,242) | $ 29,297
Balance, shares at Dec. 31, 2017 | 51,293,070 |  |  |  |  | 51,293,070
[1] | Representing amount lower than $1.

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