FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured and Carried at Fair Value

The tables below present information about the Company’s financial assets and liabilities that are measured and carried at fair value and indicate the level within the fair value hierarchy of valuation techniques it utilizes to determine such fair value: 

	Fair Value Measurement as of June 30, 2019
	Total		Level 1		Level 2		Level 3
	(in thousands)
Assets
Money market funds	$	181,040	$	181,040	$	—	$	—
Commercial paper		87,370		—		87,370		—
Government and government agency bonds		677,242		677,242		—		—
Corporate bonds		19,982		19,982		—		—
Strategic equity investments		32,154		2,154		—		30,000
Certificates of deposit		1,001		1,001		—		—
Total assets	$	998,789	$	881,419	$	87,370	$	30,000
Liabilities
Contingent consideration	$	5,200	$	—	$	—	$	5,200
Total liabilities	$	5,200	$	—	$	—	$	5,200

	Fair Value Measurement as of December 31, 2018
	Total		Level 1		Level 2		Level 3
	(in thousands)
Assets
Money market funds	$	42,920	$	42,920	$	—	$	—
Commercial paper		125,907		—		125,907		—
Government and government agency bonds		760,235		760,235		—		—
Corporate bonds		43,468		43,468		—		—
Strategic equity investments		31,739		1,739		—		30,000
Certificates of deposit		1,001		1,001		—		—
Total	$	1,005,270	$	849,363	$	125,907	$	30,000