Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Measurements

Schedule of financial instruments measured at fair value on recurring basis

	Actively Quoted		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable		Balance at
	Assets		Inputs		Inputs		June 30,
	Level 1		Level 2		Level 3		2016
	(In thousands)
As of June 30, 2016:
Assets
Money market deposits	$	14,017	$	—	$	—	$	14,017
Commercial paper		—		27,224		—		27,224
Corporate debt securities		—		13,014		—		13,014
Corporate equity securities		—		12,656		—		12,656
Total	$	14,017	$	52,894	$	—	$	66,911

	Actively Quoted		Significant
	Markets for		Other		Significant
	Identical		Observable		Unobservable		Balance at
	Assets		Inputs		Inputs		December 31,
	Level 1		Level 2		Level 3		2015
	(In thousands)
As of December 31, 2015:
Assets
Money market deposits	$	13,928	$	—	$	—	$	13,928
Commercial paper		—		29,224		—		29,224
Corporate debt securities		—		22,359		—		22,359
Corporate equity securities		—		18,126		—		18,126
Total	$	13,928	$	69,709	$	—	$	83,637

Summary of available-for-sale marketable securities

	June 30, 2016
	Cost or		Gross		Gross		Total
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
	(In thousands)
Commercial paper	$	27,164	$	60	$	—	$	27,224
Corporate debt securities		13,014		3		(3)		13,014
Corporate equity securities		10,749		1,907		—		12,656
Total	$	50,927	$	1,970	$	(3)	$	52,894

	December 31, 2015
	Cost or		Gross		Gross		Total
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
	(In thousands)
Commercial paper	$	23,684	$	41	$	—	$	23,725
Corporate debt securities		20,569		—		(10)		20,559
Corporate equity securities		13,857		4,269		—		18,126
Total	$	58,110	$	4,310	$	(10)	$	62,410