Fair Value (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Measurement of Financial Assets

The following table sets forth information regarding the recurring fair value measurement of our financial assets as reflected on our Condensed Consolidated Balance Sheet as of March 31, 2013:


			Fair Value Measurements at Reporting Date Using
			(Level 1)		(Level 2)		(Level 3)
Description	As of March 31, 2013		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Cash equivalents:
Money market fund	$	204,838	$	204,838	$	0	$	0
Restricted cash:
Money market fund		3,374		3,374		0		0
Other assets:
Money market fund		8,623		8,623		0		0

	$	216,835	$	216,835	$	0	$	0

The following table sets forth information regarding the fair value measurement of our financial assets as of March 31, 2012:


			Fair Value Measurements at Reporting Date Using
			(Level 1)		(Level 2)		(Level 3)
Description	As of March 31, 2012		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Cash equivalents:
Money market funds	$	169,263	$	169,263	$	0	$	0
Short-term investments:
U.S. Treasury obligations		80,445		80,445		0		0
Government agency obligations		17,022		0		17,022		0
Corporate obligations		17,339		0		17,339		0
Restricted cash:
Money market fund		6,506		6,506		0		0
Other assets:
Money market fund		8,619		8,619		0		0

	$	299,194	$	264,833	$	34,361	$	0