SIGNIFICANT ACCOUNTING POLICIES - FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Net financial assets (liabilities)
Warrants to purchase Ordinary Shares	$ (7,078)
Recurring basis
Net financial assets (liabilities)
Reverse Repurchase Agreements	13,001	$ 31,000
Money Market Funds	6,455
Net financial assets (liabilities)	12,378	31,000
Recurring basis | Convertible Preferred Shares
Net financial assets (liabilities)
Warrants to purchase Ordinary Shares	(7,078)
Level 1 | Recurring basis
Net financial assets (liabilities)
Money Market Funds	6,455
Net financial assets (liabilities)	6,455
Level 2 | Recurring basis
Net financial assets (liabilities)
Reverse Repurchase Agreements	13,001	31,000
Net financial assets (liabilities)	13,001	$ 31,000
Level 3 | Recurring basis
Net financial assets (liabilities)
Net financial assets (liabilities)	(7,078)
Level 3 | Recurring basis | Convertible Preferred Shares
Net financial assets (liabilities)
Warrants to purchase Ordinary Shares	$ (7,078)