Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2016

Available-for-sale Securities [Abstract]

Cash equivalents and marketable securities classified as available-for-sale

All cash equivalents and marketable securities are classified as available-for-sale. Total cash, cash equivalents and marketable securities are summarized as follows:



	As of September 30, 2016
(In thousands)	Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Weighted Rate of Return
Money market funds	$	12,562	$	12,562	$	—	$	—		0.24	%
U.S. Government bonds and notes	7,001		7,000		1		—			0.44	%
Corporate notes, bonds, commercial paper and other	70,605		70,652		—		(47		)	0.62	%
Total cash equivalents and marketable securities	90,168		90,214		1		(47		)
Cash	60,621		60,621		—		—
Total cash, cash equivalents and marketable securities	$	150,789	$	150,835	$	1	$	(47	)



	As of December 31, 2015
(In thousands)	Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Weighted Rate of Return
Money market funds	$	77,804	$	77,804	$	—	$	—		0.12	%
U.S. Government bonds and notes	14,110		14,142		—		(32		)	0.48	%
Corporate notes, bonds, commercial paper and other	160,823		160,979		—		(156		)	0.45	%
Total cash equivalents and marketable securities	252,737		252,925		—		(188		)
Cash	34,969		34,969		—		—
Total cash, cash equivalents and marketable securities	$	287,706	$	287,894	$	—	$	(188	)

Available-for-sale securities reported at fair value

Available-for-sale securities are reported at fair value on the balance sheets and classified as follows:



	As of
	September 30, 2016		December 31, 2015
	(In thousands)
Cash equivalents	$	28,858	$	108,795
Short term marketable securities	61,310		143,942
Total cash equivalents and marketable securities	90,168		252,737
Cash	60,621		34,969
Total cash, cash equivalents and marketable securities	$	150,789	$	287,706

Estimated fair value of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position

The estimated fair value of cash equivalents and marketable securities classified by the length of time that the securities have been in a continuous unrealized loss position at September 30, 2016 and December 31, 2015 are as follows:



	Fair Value				Gross Unrealized Loss
	September 30, 2016		December 31, 2015		September 30, 2016			December 31, 2015
	(In thousands)
Less than one year
U.S. Government bonds and notes	$	—	$	14,110	$	—		$	(32	)
Corporate notes, bonds and commercial paper	66,245		145,563		(47		)	(156		)
Total Corporate notes, bonds, and commercial paper and U.S. Government bonds and notes	$	66,245	$	159,673	$	(47	)	$	(188	)