Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Carrying Value and Estimated Fair Value of Financial Instruments

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:

	December 31,				September 30,
	2020				2021
	Carrying		Fair		Carrying		Fair
	amount		value		amount		value
	(In thousands)
Cash and cash equivalents	$	70,637	$	70,637	$	75,959	$	75,959
Accounts receivable, net		10,731		10,731		15,106		15,106
Accounts payable		2,632		2,632		4,502		4,502