FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2017

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 June 30, 2017 (in thousands):

			Fair Value Measurements, Using
	Total carrying value as of June 30, 2017		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	27,358	$	27,358	$	—	$	—
Short-term investments		256,117		256,117		—		—
Long-term investments		14,775		14,775		—		—

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

			Fair Value Measurements, Using
	Total carrying value as of December 31, 2016		Quoted prices in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents	$	71,773	$	71,773	$	—	$	—
Short-term investments		188,644		188,644		—		—
Long-term investments		14,960		14,960		—		—