Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2013

Investments Debt And Equity Securities [Abstract]

Short-term Investments Available-for-sale Securities

Short-term investments consisted of available-for-sale securities at December 31, 2013 as follows:

Type of security	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(In thousands)
U.S. government-related debt securities	$	1,565	$	1	$	—		$	1,566
Corporate debt securities		31,128		24		(3	)		31,149
Total available-for-sale securities	$	32,693	$	25	$	(3	)	$	32,715

Fair Values of Available-for-sale Securities by Contractual Maturity

The fair values of available-for-sale securities by contractual maturity at December 31, 2013 were as follows (in thousands):

Maturing in one year or less	$	26,725
Maturing after one year through three years		5,990
Total available-for-sale securities	$	32,715