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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, 2017 | $ 140 | $ 337,382 | $ 17 | $ (308,242) | $ 29,297
Balance, shares at Dec. 31, 2017 | 51,293,070 |  |  |  |
Options exercised | $ 2 | 683 |  |  | 685
Options exercised, shares | 765,420 |  |  |  |
Issuance of shares and warrants, net | $ 22 | 27,689 |  |  | 27,711
Issuance of shares and warrants, net, shares | 7,791,294 |  |  |  |
Stock-based compensation relating to options issued to employees, directors and non-employees |  | 2,166 |  |  | 2,166
Changes in other comprehensive income (loss) from foreign currency derivative contracts |  |  | (17) |  | (17)
Net loss |  |  |  | (22,599) | (22,599)
Balance at Dec. 31, 2018 | $ 164 | 367,920 |  | (330,841) | 37,243
Balance, shares at Dec. 31, 2018 | 59,849,784 |  |  |  |
Options exercised | $ 3 | 3,246 |  |  | 3,249
Options exercised, shares | 878,378 |  |  |  |
Issuance of shares and warrants, net | $ 20 | 22,738 |  |  | 22,758
Issuance of shares and warrants, net, shares | 7,194,674 |  |  |  |
Stock-based compensation relating to options issued to employees, directors and non-employees |  | 2,408 |  |  | 2,408
Net loss |  |  |  | (27,337) | (27,337)
Balance at Dec. 31, 2019 | $ 187 | 396,312 |  | (358,178) | $ 38,321
Balance, shares at Dec. 31, 2019 | 67,922,836 |  |  |  | 67,922,836
Options exercised | $ 9 | 15,906 |  |  | $ 15,915
Options exercised, shares | 3,070,542 |  |  |  |
Warrants exercised | $ 11 | 18,314 |  |  | 18,325
Warrants exercised, shares | 3,866,139 |  |  |  |
Issuance of shares, net | $ 24 | 74,123 |  |  | 74,147
Issuance of shares, net, shares | 8,816,339 |  |  |  |
Stock-based compensation relating to options issued to employees, directors and non-employees |  | 2,772 |  |  | 2,772
Net loss |  |  |  | (29,698) | (29,698)
Balance at Dec. 31, 2020 | $ 231 | $ 507,427 |  | $ (387,876) | $ 119,782
Balance, shares at Dec. 31, 2020 | 83,675,856 |  |  |  | 83,675,856

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