Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2019

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,
	2018				2019
	Carrying		Fair		Carrying		Fair
	amount		value		amount		value
	(In thousands)
Cash and cash equivalents	$	45,414	$	45,414	$	50,224	$	50,224
Accounts receivable, net		12,140		12,140		13,433		13,433
Accounts payable		3,235		3,235		3,498		3,498