MARKETABLE SECURITIES (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of marketable securities

	September 30, 2021								December 31, 2020
(in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value		Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Government debt	$	2,000	$	—	$	—	$	2,000	$	39,996	$	—	$	(8)	$	39,988
Corporate debt	233,556		25		(144)		233,437		253,345		88		(152)		253,281
	$	235,556	$	25	$	(144)	$	235,437	$	293,341	$	88	$	(160)	$	293,269