FAIR VALUE MEASUREMENTS - Schedule of Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund	$ 30,000	$ 0
Derivative assets	341	1,258
Non-marketable securities	2,753	3,384	$ 4,383
Total assets	33,094	4,642
Derivative liabilities	82	0
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund	30,000
Derivative assets	0
Non-marketable securities	0
Total assets	30,000
Derivative liabilities	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund	0	0
Derivative assets	341	1,258
Non-marketable securities	0	0
Total assets	341	1,258
Derivative liabilities	82	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market fund	0	0
Derivative assets	0	0
Non-marketable securities	2,753	3,384
Total assets	2,753	3,384
Derivative liabilities	$ 0	$ 0