Marketable Securities (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2017
(In thousands)	Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Weighted Rate of Return
Money market funds	$	11,075	$	11,075	$	—	$	—		0.60	%
U.S. Government bonds and notes	35,975		35,975		1		(1		)	0.72	%
Corporate notes, bonds, commercial paper and other	86,647		86,669		—		(22		)	0.80	%
Total cash equivalents and marketable securities	133,697		133,719		1		(23		)
Cash	53,928		53,928		—		—
Total cash, cash equivalents and marketable securities	$	187,625	$	187,647	$	1	$	(23	)



	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
	March 31, 2017		December 31, 2016
	(In thousands)
Cash equivalents	$	123,527	$	84,263
Short term marketable securities	10,170		36,888
Total cash equivalents and marketable securities	133,697		121,151
Cash	53,928		51,031
Total cash, cash equivalents and marketable securities	$	187,625	$	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 March 31, 2017 and December 31, 2016 are as follows:



	Fair Value				Gross Unrealized Loss
	March 31, 2017		December 31, 2016		March 31, 2017			December 31, 2016
	(In thousands)
Less than one year
U.S. Government bonds and notes	$	12,982	$	18,395	$	(1	)	$	—
Corporate notes, bonds and commercial paper	85,967		54,377		(22		)	(21		)
Total Corporate notes, bonds, and commercial paper and U.S. Government bonds and notes	$	98,949	$	72,772	$	(23	)	$	(21	)