Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			$ (2,228)
Other comprehensive loss before reclassifications			(1,080)
Amounts reclassified from accumulated other comprehensive loss			(166)
Net change in accumulated other comprehensive income (loss)	(54)	747	(1,246)	379
Ending balance	(3,474)		(3,474)
Unrealized Gain on Auction Rate Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			166
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			(166)
Net change in accumulated other comprehensive income (loss)			(166)
Ending balance	0		0
Unrealized Gain on Other Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			16
Other comprehensive loss before reclassifications			(64)
Amounts reclassified from accumulated other comprehensive loss			0
Net change in accumulated other comprehensive income (loss)			(64)
Ending balance	(48)		(48)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(1,650)
Other comprehensive loss before reclassifications			(1,016)
Amounts reclassified from accumulated other comprehensive loss			0
Net change in accumulated other comprehensive income (loss)			(1,016)
Ending balance	(2,666)		(2,666)
Accumulated Tax Effect [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(760)
Other comprehensive loss before reclassifications			0
Amounts reclassified from accumulated other comprehensive loss			0
Net change in accumulated other comprehensive income (loss)			0
Ending balance	$ (760)		$ (760)