Fair Value Of Financial Instruments And Investments (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Of Financial Instruments And Investments [Abstract]

Financial Instruments Measured At Fair Value On Recurring Basis

March 31, 2012	Carrying Amount		Estimated Fair  Value		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Cash and cash equivalents:
Cash	$	12,529	$	12,529	$	12,529	$	—	$	—
Money market funds		70,036		70,036		70,036		—		—
Total cash and cash equivalents		82,565		82,565		82,565		—		—
Short-term investments:
Certificates of deposit		48,408		48,408		48,408		—		—
Total short-term investments		48,408		48,408		48,408		—		—
Total cash and cash equivalents and short-term investments		130,973		130,973		130,973		—		—
Restricted cash:
Certificates of deposit		2,780		2,780		2,780		—		—
Total restricted cash		2,780		2,780		2,780		—		—
Total	$	133,753	$	133,753	$	133,753	$	—	$	—
December 31, 2011	Carrying Amount		Estimated Fair Value		Level 1		Level 2		Level 3
	(In thousands)
Assets:
Cash and cash equivalents:
Cash	$	8,680	$	8,680	$	8,680	$	—	$	—
Money market funds		105,414		105,414		105,414		—		—
Total cash and cash equivalents		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		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	$	172,368	$	—	$	—