Fair Value Measures (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Measures [Abstract]

Financial assets and liabilities carried at fair value and measured on a recurring basis

The fair value hierarchy of the Company’s financial assets and liabilities carried at fair value and measured on a recurring basis is as follows (in thousands):

				Fair value measurements at the reporting date using
	September 30, 2012			Quoted prices in active markets using identical assets (Level 1)		Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Assets
Cash equivalents:
U.S. government securities	$	22,623		$	—	$	22,623		$	—
Money market and other funds		24,201			—		24,201			—
Commercial paper		10,074			—		10,074			—
Time deposits		1,990			—		1,990			—
Taxable municipal bonds		3,052			—		3,052			—
Total cash equivalents		61,940			—		61,940			—
Available-for-sale securities:
U.S. government securities		27,264			—		27,264			—
Commercial paper		4,595			—		4,595			—
Time deposits		5,713			—		5,713			—
Taxable municipal bonds		16,438			—		16,438			—
Total available-for-sale securities		54,010			—		54,010			—
Total assets		115,950			—		115,950			—
Liabilities
Derivative instruments
Warrant (see Note 6)		(10,492	)		—		—			(10,492	)
Interest rate swap (see Note 9)		(459	)		—		(459	)		—
Total liabilities		(10,951	)		—		(459	)		(10,492	)
Total assets and liabilities at fair value	$	104,999		$	—	$	115,491		$	(10,492	)
				Fair value measurements at the reporting date using
	December 31, 2011			Quoted prices in active markets using identical assets (Level 1)		Significant other observable inputs (Level 2)			Significant unobservable inputs (Level 3)
Assets
Cash equivalents:
Money market funds	$	32,637		$	—	$	32,637		$	—
Commercial paper		20,000			—		20,000			—
Total cash equivalents		52,637			—		52,637			—
Available-for-sale securities:
U.S. government securities		162,170			—		162,170			—
Commercial paper		49,484			—		49,484			—
Total available-for-sale securities		211,654			—		211,654			—
Total assets at fair value	$	264,291		$	—	$	264,291		$	—

Maturity information for investments classified as available-for-sale

Maturity information was as follows for investments classified as available-for-sale at September 30, 2012 (in thousands):

	Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Within one year	$	54,000	$	14	$	(4	)	$	54,010
Greater than one year		—		—		—			—
Total	$	54,000	$	14	$	(4	)	$	54,010

Maturity information was as follows for investments classified as available-for-sale at December 31, 2011 (in thousands):

	Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value
Within one year	$	211,622	$	34	$	(2	)	$	211,654
Greater than one year		—		—		—			—
Total	$	211,622	$	34	$	(2	)	$	211,654