Short-term Investments

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Short-term Investments

7. Short-term Investments

Short-term investments consisted of available-for-sale securities as follows (in thousands):

Type of security as of September 30, 2013	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
U.S. government-related debt securities	$	1,581	$	2	$	—		$	1,583
Corporate debt securities		31,336		11		(8	)		31,339
Total available-for-sale securities	$	32,917	$	13	$	(8	)	$	32,922

The Company did not have available-for-sale securities at December 31, 2012.

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

Contractual maturity	September 30, 2013		December 31, 2012
Maturing in one year or less	$	20,093	$	—
Maturing after one year through three years		12,829		—
Total available-for-sale securities	$	32,922	$	—