Fair Value (Tables)

3 Months Ended

Mar. 29, 2014

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

Fair value measured on a recurring basis as of March 29, 2014 (in thousands): 

	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	25,155	$	—	$	25,155
Commercial paper	—		5,599		5,599
Marketable securities
U.S. Treasuries	—		51,404		51,404
Agency securities (Federal)	—		37,795		37,795
Total	$	25,155	$	94,798	$	119,953

Fair value measured on a recurring basis as of December 28, 2013 (in thousands):

	Level 1		Level 2		Total
Assets:
Cash equivalents
Money market funds	$	27,943	$	—	$	27,943
Commercial paper	—		11,623		11,623
Marketable securities
U.S. Treasuries	—		49,014		49,014
Agency securities (Federal)	—		31,258		31,258
Total	$	27,943	$	91,895	$	119,838