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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenue $ 712 $ 9,277
Cost of revenue 223 1,633
Gross profit 489 7,644
Operating expenses:      
Research and development expenses, net 28,583 24,549 21,245
Marketing and business development expenses 1,189 1,174 1,309
General and administrative expenses 7,633 7,349 6,008
Total operating expenses 37,405 33,072 28,562
Operating loss (37,405) (32,583) (20,918)
Financial and other income, net 339 1,097 1,145
Loss before taxes on income (37,066) (31,486) (19,773)
Taxes on income (20) (390)
Net loss $ (37,066) $ (31,506) $ (20,163)
Basic net loss per share $ (0.72) $ (0.62) $ (0.40)
Diluted net loss per share $ (0.72) $ (0.62) $ (0.40)
Other comprehensive loss:      
Unrealized loss arising during the period from marketable securities $ (205)
Realized gain arising during the period from marketable securities (440) (436)
Unrealized gain (loss) arising during the period from foreign currency derivative contracts 17 7 (19)
Realized loss (gain) arising during the period from foreign currency derivative contracts (7) 19 (141)
Total comprehensive loss $ (37,056) $ (31,920) $ (20,964)
Weighted average number of ordinary shares used in computing basic net loss per share 51,179,694 50,855,908 50,437,040
Weighted average number of ordinary shares used in computing diluted net loss per share 51,179,694 50,855,908 50,437,040