Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Assets measured at fair value on a recurring basis

Assets measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 were as follows (in thousands):

	September 30, 2015
	Level 1		Level 2		Level 3		Total
Cash Equivalents
Money market funds	$	8,401	$	—	$	—	$	8,401
Commercial paper	—		7,097		—		7,097
Corporate bonds	—		308		—		308
Total cash equivalents	8,401		7,405		—		15,806
Available-for-Sale Securities
Certificates of deposit(1)	—		24,531		—		24,531
Commercial paper	—		2,798		—		2,798
Corporate bonds	—		18,318		—		18,318
Total available-for-sale securities	—		45,647		—		45,647
Total assets measured at fair value	$	8,401	$	53,052	$	—	$	61,453

	December 31, 2014
	Level 1		Level 2		Level 3		Total
Cash Equivalents
Money market funds	$	2,591	$	—	$	—	$	2,591
Certificates of deposit(1)	—		980		—		980
Commercial paper	—		12,497		—		12,497
Variable rate demand notes	—		8,000		—		8,000
Total cash equivalents	2,591		21,477		—		24,068
Available-for-Sale Securities
Certificates of deposit(1)	—		14,202		—		14,202
Corporate bonds	—		12,782		—		12,782
Total available-for-sale securities	—		26,984		—		26,984
Total assets measured at fair value	$	2,591	$	48,461	$	—	$	51,052

⁽¹⁾ All certificates of deposit are within current FDIC insurance limits.