Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017
(In thousands)	Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Weighted Rate of Return
Money market funds	$	12,882	$	12,882	$	—	$	—		0.90	%
U.S. Government bonds and notes	30,489		30,491		—		(2		)	0.95	%
Corporate notes, bonds, commercial paper and other	98,887		98,900		—		(13		)	1.13	%
Total cash equivalents and marketable securities	142,258		142,273		—		(15		)
Cash	41,374		41,374		—		—
Total cash, cash equivalents and marketable securities	$	183,632	$	183,647	$	—	$	(15	)



	As of December 31, 2016
(In thousands)	Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Weighted Rate of Return
Money market funds	$	10,681	$	10,681	$	—	$	—		0.41	%
U.S. Government bonds and notes	48,292		48,291		1		—			0.39	%
Corporate notes, bonds, commercial paper and other	62,178		62,199		—		(21		)	0.66	%
Total cash equivalents and marketable securities	121,151		121,171		1		(21		)
Cash	51,031		51,031		—		—
Total cash, cash equivalents and marketable securities	$	172,182	$	172,202	$	1	$	(21	)

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, 2017		December 31, 2016
	(In thousands)
Cash equivalents	$	140,971	$	84,263
Short term marketable securities	1,287		36,888
Total cash equivalents and marketable securities	142,258		121,151
Cash	41,374		51,031
Total cash, cash equivalents and marketable securities	$	183,632	$	172,182

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, 2017 and December 31, 2016 are as follows:



	Fair Value				Gross Unrealized Loss
	September 30, 2017		December 31, 2016		September 30, 2017			December 31, 2016
	(In thousands)
Less than one year
U.S. Government bonds and notes	$	27,489	$	18,395	$	(2	)	$	—
Corporate notes, bonds and commercial paper	97,600		54,377		(13		)	(21		)
Total Corporate notes, bonds, and commercial paper and U.S. Government bonds and notes	$	125,089	$	72,772	$	(15	)	$	(21	)