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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