FAIR VALUE MEASUREMENT - Summary of Level 3 Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Common Stock Warrants [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 711
Change in fair value recognized in earnings		55
Ending balance		$ 766
Contingent Consideration Liability [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 166,800
Fair value adjustment	(14,730)
Ending balance	$ 152,070