FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2016

FAIR VALUE MEASUREMENTS

Schedule of fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis

        The following table presents the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2016:

	Level 1		Level 2		Level 3			Total
Cash Equivalents:
Money market funds	$	49,696	$	—	$	—		$	49,696
Short-term investments:
Corporate notes and bonds		—		404,439		—			404,439
U.S. agency obligations		—		83,047		—			83,047
U.S. treasury securities		—		74,925		—			74,925
Commercial paper		—		16,869		—			16,869
Certificates of deposit		—		4,808		—			4,808
Other Current Liabilities:
Contingent consideration		—		—		(2,889	)		(2,889	)
Total	$	49,696	$	584,088	$	(2,889	)	$	630,895

        The following table presents the fair value hierarchy for financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2015:

	Level 1		Level 2		Level 3			Total
Cash Equivalents:
Money market funds	$	2,521	$	—	$	—		$	2,521
Short-term investments:
Corporate notes and bonds		—		387,876		—			387,876
U.S. agency obligations		—		121,329		—			121,329
U.S. treasury securities		—		60,185		—			60,185
Commercial paper		—		36,821		—			36,821
Certificates of deposit		—		7,919		—			7,919
Other Current Liabilities:
Contingent consideration		—		—		(2,300	)		(2,300	)
Total	$	2,521	$	614,130	$	(2,300	)	$	614,351