Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Inventories:
Raw materials	$ 0	$ 19
Work-in-process	1,191	1,343
Finished goods	3,761	2,774
Inventories	4,952us-gaap_InventoryNet	4,136us-gaap_InventoryNet
Other current assets:
Prepaid expenses	1,042us-gaap_PrepaidExpenseCurrent	845us-gaap_PrepaidExpenseCurrent
Other	104us-gaap_OtherAssetsCurrent	427us-gaap_OtherAssetsCurrent
Other current assets	1,146	1,272
Accrued liabilities:
Employee related accruals	1,356	2,821
Other	218us-gaap_OtherAccruedLiabilitiesCurrent	698us-gaap_OtherAccruedLiabilitiesCurrent
Accrued liabilities	$ 1,574us-gaap_AccruedLiabilitiesCurrent	$ 3,519us-gaap_AccruedLiabilitiesCurrent

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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