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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenue $ 17,800
Cost of revenue 1,034
Gross profit 16,766
Operating expenses:      
Research and development expenses, net 19,816 30,318 28,583
Marketing and business development expenses 651 1,634 1,189
General and administrative expenses 8,412 8,041 7,633
Total operating expenses 28,879 39,993 37,405
Operating loss (28,879) (23,227) (37,405)
Financial and other income, net 820 628 339
Loss before taxes on income (28,059) (22,599) (37,066)
Taxes on income 722
Net loss $ (27,337) $ (22,599) $ (37,066)
Basic net loss per share $ (0.43) $ (0.41) $ (0.72)
Diluted net loss per share $ (0.43) $ (0.41) $ (0.72)
Other comprehensive loss:      
Unrealized gain arising during the period from foreign currency derivative contracts $ 17
Realized loss (gain) arising during the period from foreign currency derivative contracts (17) (7)
Total comprehensive loss $ (27,337) $ (22,616) $ (37,056)
Weighted average number of ordinary shares used in computing basic net loss per share 63,636,673 55,277,428 51,179,694
Weighted average number of ordinary shares used in computing diluted net loss per share 63,636,673 55,277,428 51,179,694