Cash and Cash Equivalents, and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2018

Cash and Cash Equivalents, and Marketable Securities

Schedule of cash and cash equivalents, and marketable securities

		March 31,		December 31,
		2018		2017
	(In thousands)
Cash and cash equivalents
Cash		$	30,584	$	35,303
Money market deposits			11,501		10,215
Total cash and cash equivalents			42,085		45,518
Marketable securities
Commercial paper			34,945		30,272
Corporate debt securities			49,566		50,260
Corporate equity securities			3,791		3,525
Total marketable securities			88,302		84,057
Total cash and cash equivalents, and marketable securities		$	130,387	$	129,575

Summary of available-for-sale securities

	March 31, 2018
	Cost or		Gross		Gross		Total
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
	(In thousands)
Commercial paper	$	34,996	$	3	$	(54)	$	34,945
Corporate debt securities		49,674		—		(108)		49,566
Total	$	84,670	$	3	$	(162)	$	84,511

	December 31, 2017
	Cost or		Gross		Gross		Total
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
	(In thousands)
Commercial paper	$	30,315	$	—	$	(43)	$	30,272
Corporate debt securities		50,331		2		(73)		50,260
Corporate equity securities		4,020		—		(495)		3,525
Total	$	84,666	$	2	$	(611)	$	84,057

Schedule of the breakdown of available-for-sale marketable securities with unrealized losses

	In a Loss Position for
	Less Than 12 Months
	Gross
	Unrealized		Estimated
	Losses		Fair Value
	(In thousands)
As of March 31, 2018:
Commercial paper	$	(54)	$	30,519
Corporate debt securities		(108)		49,566
Total	$	(162)	$	80,085
As of December 31, 2017:
Commercial paper	$	(43)	$	30,272
Corporate debt securities		(73)		45,110
Corporate equity securities		(495)		3,525
Total	$	(611)	$	78,907