FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of March 31, 2016 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of March 31, 2016		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	64,580	$	64,580	$	—	$	—
Short-term investments	269,498		269,498		—		—
Long-term investments	16,092		16,092		—		—

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2015 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of December 31, 2015		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	34,980	$	34,980	$	—	$	—
Short-term investments	297,981		297,981		—		—
Long-term investments	2,187		2,187		—		—