WARRANTS TO PURCHASE CONVERTIBLE PREFERRED SHARES - Components of liability (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 25, 2015	Mar. 19, 2015	Dec. 31, 2015	Dec. 31, 2014
Warrants Liabilities Roll Forward
Balance, beginning		$ 6,072	$ 6,072
Classification to equity upon conversion of warrants			(5,945)
Classification to equity upon automatic conversion into warrants to purchase Ordinary Shares			(87)
Balance, ending				$ 6,072
Warrants Disclosures
Number of Warrants for Convertible Preferred Shares exercised for cash (in shares)		295,697
Number of Warrants for Convertible Preferred Shares exercised on cashless basis (in shares)		405,232
Net number of Warrants for Convertible Preferred Shares exercised (in shares)		401,746
Number of Warrants for Convertible Preferred Shares cancelled (in shares)		3,486
Number of Warrants for Convertible Preferred Shares automatically converted into warrants for Ordinary Shares (in shares)	10,191
Convertible Preferred Stock Warrant
Warrants Liabilities Roll Forward
Balance, beginning		$ 6,072	6,072	1,300
Issuance of warrants to purchase Convertible Preferred Shares				1,845
Revaluation of warrants to purchase Convertible Preferred Shares			(40)	2,927
Classification to equity upon conversion of warrants			(5,945)
Classification to equity upon automatic conversion into warrants to purchase Ordinary Shares			$ (87)
Balance, ending				$ 6,072
Warrants Disclosures
Warrants outstanding (in shares)		10,191		711,120
Ordinary Shares Stock Warrant
Warrants Disclosures
Warrants outstanding (in shares)			10,191