Balance Sheet Components (Property and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 29, 2013
Property and equipment:
Property and equipment, gross	$ 18,571	$ 17,993
Accumulated depreciation and amortization	(15,682)	(15,153)
Property and equipment, net	2,889	2,840
Equipment [Member]
Property and equipment:
Property and equipment, gross	13,883	13,294
Software [Member]
Property and equipment:
Property and equipment, gross	3,332	3,349
Furniture and Fixtures [Member]
Property and equipment:
Property and equipment, gross	710	710
Leasehold Improvements [Member]
Property and equipment:
Property and equipment, gross	$ 646	$ 640

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant