Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy

The following table sets forth the fair value of the Company’s financial assets and liabilities measured at fair value based on the three-tier fair value hierarchy (in thousands):

	Level 1		Level 2		Level 3		Total
As of December 31, 2012
Cash equivalents
Money market funds	$	54,923	$	—	$	—	$	54,923
Corporate bonds with maturity less than 90 days		—		3,614		—		3,614
U.S. federal government bonds with maturity less than 90 days		3,005		—		—		3,005
Short-term investments
Certificates of deposit		—		1,603		—		1,603
State, municipal and local government agencies bonds		—		59,050		—		59,050
Corporate bonds		—		31,562		—		31,562
Commercial paper		—		10,288		—		10,288
U.S. federal government bonds		2,003		—		—		2,003
Prepaids and other current assets
Foreign exchange forward contracts		—		344		—		344
Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
Accrued Liabilities
Foreign exchange forward contracts	$	—	$	143	$	—	$	143
Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143

	Level 1		Level 2		Level 3		Total
As of December 31, 2011
Cash equivalents
Money market funds	$	62,131	$	—	$	—	$	62,131
Short-term investments
State, municipal and local government agencies bonds		—		38,825		—		38,825
Corporate bonds		—		18,604		—		18,604
Commercial paper		—		4,195		—		4,195
U.S. federal government bonds		9,230		—		—		9,230
Prepaids and other current assets
Foreign exchange forward contracts		—		373		—		373
Total assets measured and recorded at fair value	$	71,361	$	61,997	$	—	$	133,358
Accrued liabilities
Foreign exchange forward contracts	$	—	$	159	$	—	$	159
Total liabilities measured and recorded at fair value	$	—	$	159	$	—	$	159