INVESTMENTS AND FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2020

Investments And Fair Value Disclosures [Abstract]

Schedule of available for sale securities reconciliation

The following table represents the Company's investments in marketable securities and fair value measurements by investment category reported as cash equivalents and investments as of December 31, 2019 (in thousands):

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross  Unrealized Losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents	$	576,761	$	—	$	—		$	576,761	$	576,761	$	—	$	—
Auction rate securities	10,800		—		(730		)	10,070		—		—		10,070
Total cash equivalents and long-term investments	$	587,561	$	—	$	(730	)	$	586,831	$	576,761	$	—	$	10,070

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

The following table represents the Company's investments in marketable securities and fair value measurements by investment category reported as cash equivalents and investments as of December 31, 2019 (in thousands):

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross  Unrealized Losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents	$	576,761	$	—	$	—		$	576,761	$	576,761	$	—	$	—
Auction rate securities	10,800		—		(730		)	10,070		—		—		10,070
Total cash equivalents and long-term investments	$	587,561	$	—	$	(730	)	$	586,831	$	576,761	$	—	$	10,070