Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Dec. 31, 2011
Components of accrued expenses
Accrued warranty	$ 6,057	$ 10,306
Accrued direct fulfillment costs	999	1,907
Accrued rent	696	726
Accrued sales commissions	475	411
Accrued accounting fees	155	354
Uncertain tax positions - short-term	2,884	957
Accrued other	5,261	2,527
Accrued expenses, total	$ 16,527	$ 17,188