Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Carrying Value and Fair Value of Certain Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table provides the carrying value and fair value of certain financial assets and liabilities of the Company measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014:

	Carrying Value		Fair Value Measurement at March 31, 2015
			Level 1		Level 2		Level 3
	(Unaudited - In thousands)
Cash and cash equivalents	$	85,086	$	85,086	$	—	$	—
Marketable securities—held-to-maturity:
Commercial paper	$	2,899	$	2,899	$	—	$	—
U.S. treasury bills	1,503		1,503		—		—
Government agency bonds	502		502		—		—
Certificates of deposit	40,228		40,228		—		—
Total marketable securities	$	45,132	$	45,132	$	—	$	—

	Carrying Value		Fair Value Measurement at December 31, 2014
			Level 1		Level 2		Level 3
	(Unaudited - In thousands)
Cash and cash equivalents	$	111,897	$	111,897	$	—	$	—
Marketable securities—held-to-maturity:
Commercial paper	$	6,596	$	6,596	$	—	$	—
U.S. treasury bills	1,503		1,503		—		—
Government agency bonds	503		503		—		—
Certificates of deposit	36,026		36,026		—		—
Total marketable securities	$	44,628	$	44,628	$	—	$	—