WARRANTS TO PURCHASE CONVERTIBLE PREFERRED SHARES - Summary of outstanding (Details) $ / shares in Units, $ in Thousands					36 Months Ended
	Feb. 17, 2014 $ / shares shares	Feb. 20, 2013 $ / shares shares	Jul. 19, 2012 ₪ / shares shares	Jan. 26, 2009 ₪ / shares shares	Dec. 31, 2012 ₪ / shares shares	Mar. 19, 2015 shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)
Class of Warrant or Right [Line Items]
Fair value of warrants outstanding | $							$ 6,072
Convertible Preferred Stock Warrant
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)						10,191	711,120
Fair value of warrants outstanding | $							$ 6,072	$ 1,300
Series A2 Convertible Preferred Stock Warrant
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)							28,691
Fair value of warrants outstanding | $							$ 210
Warrants issued to purchase preferred stock				17,841	10,850
Exercise price of warrants per share | ₪ / shares				₪ 0.001	₪ 0.001
Expiration term of warrants				7 years	7 years
Series D Convertible Preferred Stock Warrant
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)							441,937
Fair value of warrants outstanding | $							$ 3,434
Exercise price of warrants per share | ₪ / shares			₪ 0.001
Expiration term of warrants			7 years
Series D Convertible Preferred Stock Warrant | Bank
Class of Warrant or Right [Line Items]
Warrants issued to purchase preferred stock		7,332
Exercise price of warrants per share | $ / shares		$ 6.14
Expiration term of warrants		10 years
Series D Convertible Preferred Stock Warrant | Investors
Class of Warrant or Right [Line Items]
Warrants issued to purchase preferred stock			424,824
Series D Convertible Preferred Stock Warrant | Placement agent
Class of Warrant or Right [Line Items]
Warrants issued to purchase preferred stock			9,781
Series E Convertible Preferred Stock Warrant
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)							240,492
Fair value of warrants outstanding | $							$ 2,428
Warrants issued to purchase preferred stock	240,491
Exercise price of warrants per share | $ / shares	$ 0.001
Expiration term of warrants	7 years