Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

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, 2013
Cash equivalents
Money market funds	$	51,014	$	—	$	—	$	51,014
Short-term investments
State, municipal and local government agencies bonds	—		40,449		—		40,449
Corporate bonds	—		33,496		—		33,496
Commercial paper	—		2,299		—		2,299
U.S. federal government bonds	4,008		—		—		4,008
Prepaids and other current assets
Derivative assets (1)	—		196		—		196
Total assets measured and recorded at fair value	$	55,022	$	76,440	$	—	$	131,462
Accrued Liabilities
Derivative Liabilities (1)	$	—	$	195	$	—	$	195
Total liabilities measured and recorded at fair value	$	—	$	195	$	—	$	195

	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
Derivative assets (1)	—		344		—		344
Total assets measured and recorded at fair value	$	59,931	$	106,461	$	—	$	166,392
Accrued liabilities
Derivative liabilities (1)	$	—	$	143	$	—	$	143
Total liabilities measured and recorded at fair value	$	—	$	143	$	—	$	143

(1) Derivative assets and liabilities represent forward currency exchange contracts. The Company enters into these contracts to minimize the short-term impact of foreign currency exchange rates fluctuations primarily from trade and inter-company receivables and payables.