Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014
Cash equivalents
Money market funds	$	23,121	$	—	$	—	$	23,121
Short-term investments
State, municipal and local government agencies bonds	—		13,961		—		13,961
Corporate bonds	—		17,886		—		17,886
Prepaids and other current assets
Derivative assets	—		341		—		341
Other assets
Long-term investment	2,606		—		—		2,606
Total assets measured and recorded at fair value	$	25,727	$	32,188	$	—	$	57,915
Accrued liabilities
Derivative liabilities	$	—	$	7	$	—	$	7
Total liabilities measured and recorded at fair value	$	—	$	7	$	—	$	7

	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	—		196		—		196
Total assets measured and recorded at fair value	$	55,022	$	76,440	$	—	$	131,462
Accrued liabilities
Derivative liabilities	$	—	$	195	$	—	$	195
Total liabilities measured and recorded at fair value	$	—	$	195	$	—	$	195