Fair Value Of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010

Fair Value Of Financial Instruments [Abstract]

Financial Instruments Measured At Fair Value On Recurring Basis

December 31, 2011	Carrying Amount		Estimated Fair Value		Assets and Liabilities Measured at Fair Value		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Cash and cash equivalents:
Cash	$	8,680	$	8,680	$	8,680	$	8,680	$	—	$	—
Money market funds		105,414		105,414		105,414		105,414		—		—
Total cash and cash equivalents		114,094		114,094		114,094		114,094		—		—
Short-term investments:
Certificates of deposit		55,694		55,694		—		55,694		—		—
Total short-term investments		55,694		55,694		—		55,694		—		—
Total cash and cash equivalents and short-term investments		169,788		169,788		114,094		169,788		—		—
Restricted cash:
Certificates of deposit		2,580		2,580		—		2,580		—		—
Total restricted cash		2,580		2,580		—		2,580		—		—
Total	$	172,368	$	172,368	$	114,094	$	172,368	$	—	$	—

December 31, 2010	Carrying Amount		Estimated Fair Value		Assets and Liabilities Measured at Fair Value		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Cash and cash equivalents:
Cash	$	6,824	$	6,824	$	6,824	$	6,824	$	—	$	—
Money market funds		37,967		37,967		37,967		37,967		—		—
Total cash and cash equivalents		44,791		44,791		44,791		44,791		—		—
Short-term investments (available-for-sale):
Equity securities		—		1		1		—		1		—
Short-term investments:
Certificates of deposit		20,069		19,992		—		—		—		—
Total short-term investments		20,069		19,993		1		—		1		—
Total cash and cash equivalents and short-term investments		64,860		64,784		44,792		44,791		1		—
Restricted cash:
Certificates of deposit		1,280		1,280		—		—		—		—
Total restricted cash		1,280		1,280		—		—		—		—
Total	$	66,140	$	66,064	$	44,792	$	44,791	$	1	$	—

Schedule Of Financial Liabilities Measured At Fair Value On Recurring Basis Using Significant Unobservable Inputs

Warrant Liability	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	(In thousands)
Balance, December 31, 2009	$	24,239
Mark-to-market of warrant liability		(2,127	)
Balance, March 31, 2010	$	22,112
Exercise of warrants		(1,866	)
Mark-to-market of warrant liability		(6,200	)
Balance, June 30, 2010	$	14,046
Exercise of warrants		(816	)
Mark-to-market of warrant liability		43,233
Balance, September 30, 2010	$	56,463
Exercise of warrants		(38,365	)
Mark-to-market of warrant liability at exercise dates		(18,098	)
Balance, December 31, 2010	$	—