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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Operating activities:    
Net income $ 1,289 $ 1,941
Less income from discontinued operations 0 1,809
Income from continuing operations 1,289 132
Adjustments to reconcile net income from continuing operations to net cash provided by (used in) operating activities:    
Depreciation and amortization 240 203
Change in fair value of earn-out liability 91 78
Stock compensation expense 334 297
Provision for doubtful accounts 60 (23)
Changes in operating assets and liabilities, net of assets and liabilities acquired:    
Accounts receivable (728) (350)
Inventories (905) (880)
Prepaid expenses and other current assets 34 (764)
Other long-term assets 7 29
Accounts payable 468 559
Accrued compensation (30) 116
Accrued expenses (212) (883)
Accrued warranty 4 (31)
Deferred revenue 14 (214)
Other long-term liabilities 0 (77)
Net cash provided by (used in) operating activities 666 (1,808)
Investing activities:    
Acquisition of property and equipment (72) (174)
Payment on earn-out liability (198) (162)
Net cash used in investing activities (270) (336)
Financing activities:    
Proceeds from stock option exercises 814 364
Repurchase of common stock (76) (296)
Payment of legal costs in connection with tender offer (40) 0
Net cash provided by financing activities 698 68
Net cash provided by operating activities from discontinued operations 0 405
Net cash provided by investing activities from discontinued operations 510 4,632
Effect of foreign exchange rate changes from discontinued operations 0 35
Net cash provided by discontinued operations 510 5,072
Net increase in cash and cash equivalents 1,604 2,996
Cash and cash equivalents, beginning of period 11,901 [1] 10,789
Cash and cash equivalents, end of period 13,505 13,785
Cash paid during the period for:    
Income taxes 1 16
Non-cash financing transaction:    
Preferred stock conversion into common stock $ 5 $ 0
[1] Derived from the audited consolidated financial statements included in the annual report filed on Form 10-K with the SEC for the year ended December 29, 2012.