Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Operating activities:
Net income	$ 10,038us-gaap_NetIncomeLoss	$ 2,231us-gaap_NetIncomeLoss	$ 1,438us-gaap_NetIncomeLoss
Less income from discontinued operations			1,608
Income (loss) from continuing operations	10,038	2,231	(170)
Adjustments to reconcile net income (loss) from continuing operations to net cash provided by (used in) operating activities:
Depreciation and amortization	420us-gaap_DepreciationAndAmortization	490us-gaap_DepreciationAndAmortization	427us-gaap_DepreciationAndAmortization
Change in fair value of earn-out liability	1,258	355	215
Stock-based compensation cost recognized	972us-gaap_ShareBasedCompensation	689us-gaap_ShareBasedCompensation	388us-gaap_ShareBasedCompensation
Deferred income taxes	(8,776)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based awards	(36)
Provision for doubtful accounts	86us-gaap_ProvisionForDoubtfulAccounts	61us-gaap_ProvisionForDoubtfulAccounts	33us-gaap_ProvisionForDoubtfulAccounts
Changes in operating assets and liabilities, net of assets and liabilities acquired:
Accounts receivable	(1,078)	(1,926)	38
Inventories	1,486us-gaap_IncreaseDecreaseInInventories	(2,514)us-gaap_IncreaseDecreaseInInventories	(1,376)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	66	553	(665)
Other long-term assets	82	(16)	(88)
Accounts payable	(520)	173	525
Accrued compensation	(28)	328	383
Accrued expenses	17	171	(756)
Accrued warranty	1	15	(103)
Deferred revenue	46	129	(10)
Other long-term liabilities	(20)	28	21
Net cash provided (used in) by operating activities	4,014	767	(1,138)
Investing activities:
Acquisition of property and equipment	(568)	(380)	(394)
Payment on earn-out liability	(459)us-gaap_PaymentsForPreviousAcquisition	(383)us-gaap_PaymentsForPreviousAcquisition	(328)us-gaap_PaymentsForPreviousAcquisition
Net cash used in investing activities	(1,027)	(763)	(722)
Cash flows from financing activities:
Proceeds from stock option exercises	1,501	1,495	445
Excess tax benefits from stock-based awards	36
Repurchase of common stock	(4,665)	(426)	(2,835)
Payment of legal costs in connection with tender offer		(40)us-gaap_PaymentsOfStockIssuanceCosts
Net cash (used in) provided by financing activities	(3,128)	1,029	(2,390)
Net cash provided by operating activities from discontinued operations			695
Net cash provided by investing activities from discontinued operations		510	4,632
Effect of foreign exchange rate changes from discontinued operations			35
Net cash provided by discontinued operations		510	5,362
Net (decrease) increase in cash and cash equivalents	(141)	1,543	1,112
Cash and cash equivalents, beginning of year	13,444	11,901	10,789
Cash and cash equivalents, end of year	13,303	13,444	11,901
Cash paid (received) during the year for:
Income taxes	35us-gaap_IncomeTaxesPaidNet	(536)us-gaap_IncomeTaxesPaidNet	(145)us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash activities:
Conversion of preferred stock to common stock		$ 5

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 5

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

+ References

No definition available.

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- Definition

The cash outflow to reacquire common stock during the period.

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- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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