Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Assets Measured At Fair Value

The following tables present the Company’s assets that are measured at fair value on a recurring basis:

	September 30, 2014
(in thousands)	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurements
Short-term investments:
Fixed income mutual fund	$	2,492	$	—	$	—	$	2,492
U.S. government and agency securities	—		2,914		—		2,914
Corporate obligations	—		28,059		—		28,059
Other fixed income securities	—		437		—		437
International securities	—		12,894		—		12,894
Municipal obligations	—		547		—		547
Total	$	2,492	$	44,851	$	—	$	47,343

	December 31, 2013
(in thousands)	Quoted Market Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)		Total Fair Value Measurements
Short-term investments:
Fixed income mutual fund	$	2,485	$	—		$	—	$	2,485
U.S. government and agency securities	—		2,233			—		2,233
Corporate obligations	—		14,159		*	—		14,159
Other fixed income securities	—		361			—		361
International securities	—		3,048			—		3,048
Municipal obligations	—		1,477			—		1,477
Total	$	2,485	$	21,278		$	—	$	23,763

* Included in this amount is a corporate obligation of $4.5 million used to collateralize the Company's line of credit with Bank of America, and was included in the line item "Restricted cash and investments," a component of current assets, on the consolidated balance sheet as of December 31, 2013. Pursuant to an amendment to the loan agreement with Bank of America, effective May 19, 2014, the line of credit is no longer secured by cash or investment collateral. See Note 7, Credit Facilities, for further details.