STATEMENTS OF CASH FLOWS DATA

12 Months Ended

Dec. 31, 2021

Supplemental Cash Flow Elements [Abstract]

STATEMENTS OF CASH FLOWS DATA

11. STATEMENTS OF CASH FLOWS DATA

	Year Ended December 31,
	2021			2020			2019
	(In thousands)
Supplemental operating and investing activities:
Net unrealized (loss) gain on    marketable securities	$	(251	)	$	(54	)	$	315
Operating lease assets obtained in    exchange for operating lease liabilities		—			3,575			2,473
Interest paid	$	2,704		$	388		$	—