Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

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,				March 31,
	2016				2017
	Carrying		Fair		Carrying		Fair
	amount		value		amount		value
	(In thousands)
Cash and cash equivalents	$	33,153	$	33,153	$	30,113	$	30,113
Accounts receivable, net		10,347		10,347		12,988		12,988
Accounts payable		2,614		2,614		3,661		3,661