WARRANTS TO PURCHASE ORDINARY SHARES (Details) $ / shares in Units, $ in Thousands				3 Months Ended		12 Months Ended
	May 25, 2017 shares	Apr. 30, 2017 ₪ / shares shares	Aug. 31, 2016 ₪ / shares shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 ₪ / shares	Mar. 31, 2018 ₪ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Apr. 30, 2017 $ / shares	Aug. 31, 2016 $ / shares
Assumptions used in determination of fair value
Ordinary share, nominal value (in dollars per share) | ₪ / shares						₪ 0.01	₪ 0.01
Financial expense as a result of increase in warrants' fair value				$ 4,201	$ 12,715
Fair value of the warrants								$ 15,544	$ 11,343
Warrant to purchase Ordinary Shares
Assumptions used in determination of fair value
Exercise of warrants into Ordinary Shares (in shares) | shares	1,351,766	2,515,775	6,554,016
Ordinary share, nominal value (in dollars per share) | ₪ / shares		₪ 0.01	₪ 0.01
Exercise price of warrants (in dollars per share) | $ / shares										$ 6.785	$ 3.5995
Financial expense as a result of increase in warrants' fair value				$ 4,201
Fair value of the warrants								$ 15,544
Warrants issued on August 2016: | Monte Carlo Option Pricing Model
Assumptions used in determination of fair value
Risk-free interest rate (as a percent)				2.48%		2.12%
Expected volatility (as a percent)				76.40%		76.30%
Expected life (in years)				3 years 4 months 2 days		3 years 7 months 2 days
Expected dividend yield (as a percent)				0.00%		0.00%
Fair value per warrant (in dollars) | $ / shares								$ 2.13	$ 1.60
Warrants issued on April 2017: | Monte Carlo Option Pricing Model
Assumptions used in determination of fair value
Risk-free interest rate (as a percent)				2.48%		2.12%
Expected volatility (as a percent)				76.40%		76.30%
Expected life (in years)				4 years 26 days		4 years 3 months 26 days
Expected dividend yield (as a percent)				0.00%		0.00%
Fair value per warrant (in dollars) | $ / shares								$ 1.77	$ 1.20