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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenue $ 2,000 $ 17,800
Cost of revenue 60 1,034
Gross profit 1,940 16,766
Operating expenses:      
Research and development expenses, net 22,760 19,816 30,318
Marketing and business development expenses 871 651 1,634
General and administrative expenses 9,805 8,412 8,041
Total operating expenses 33,436 28,879 39,993
Operating loss (31,496) (28,879) (23,227)
Financial and other income, net 1,798 820 628
Loss before taxes on income (29,698) (28,059) (22,599)
Taxes on income 722
Net loss $ (29,698) $ (27,337) $ (22,599)
Basic net loss per share $ (0.37) $ (0.43) $ (0.41)
Diluted net loss per share $ (0.37) $ (0.43) $ (0.41)
Other comprehensive loss:      
Realized loss (gain) arising during the period from foreign currency derivative contracts $ (17)
Total comprehensive loss $ (29,698) $ (27,337) $ (22,616)
Weighted average number of ordinary shares used in computing basic net loss per share 79,591,187 63,636,673 55,277,428
Weighted average number of ordinary shares used in computing diluted net loss per share 79,591,187 63,636,673 55,277,428