SELECTED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Financial expenses:
Revaluation of fair value of warrants to purchase Ordinary Shares	$ 4,201	$ 12,715
Interest expense and bank fees	7	9
Foreign currency translation adjustments	43	15
Total financial expenses	4,251	12,739
Financial income:
Interest income	(92)	(18)
Total financial expense, net	$ 4,159	$ 12,721