FAIR VALUE MEASUREMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants to purchase Ordinary Shares	$ (11,076)
Warrant to purchase ordinary shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants to purchase Ordinary Shares	(11,076)
Fair Value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
RRAs	13,000	$ 31,000
Total	17,364	31,000
Fair Value | Recurring basis | MMFs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MMFs	15,440
Fair Value | Recurring basis | Warrant to purchase ordinary shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants to purchase Ordinary Shares	(11,076)
Level 1 | Fair Value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	15,440
Level 1 | Fair Value | Recurring basis | MMFs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MMFs	15,440
Level 2 | Fair Value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
RRAs	13,000	31,000
Total	13,000	$ 31,000
Level 3 | Fair Value | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	(11,076)
Level 3 | Fair Value | Recurring basis | Warrant to purchase ordinary shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants to purchase Ordinary Shares	$ (11,076)