FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair value of marketable securities and investments

The fair-value hierarchy of the Company’s cash equivalents and marketable securities at March 31, 2021, and December 31, 2020, was as follows:

	Fair Value Measurement at
	March 31, 2021
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	126,085	$	—	$	126,085
Commercial paper		297,727		—		297,727
Money market funds		13,170		13,170		—
Total	$	436,982	$	13,170	$	423,812

	Fair Value Measurement at
	December 31, 2020
			Quoted Prices in
			Active Markets for		Significant Other
			Identical Assets		Observable Inputs
(In thousands)	Total Fair Value		(Level 1)		(Level 2)
Corporate securities	$	146,658	$	—	$	146,658
Commercial paper		253,855		—		253,855
Money market funds		1,634		1,634		—
Total	$	402,147	$	1,634	$	400,513