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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Operating activities :    
Net income $ 1,941 $ 1,475
Less income from discontinued operations 1,809 391
Income from continuing operations 132 1,084
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 203 97
Change in fair value of earn-out liability 78 0
Stock compensation cost recognized 297 219
Provision for doubtful accounts (23) (12)
Provision for inventory reserves 232 (60)
Changes in operating assets and liabilities:    
Accounts receivable (350) 41
Inventories (1,112) (1,121)
Prepaid expenses and other current assets (764) (86)
Other long-term assets 29 (30)
Accounts payable 559 95
Accrued compensation 116 (278)
Accrued expenses (883) (459)
Accrued warranty (31) 21
Deferred revenue (214) (25)
Other long-term liabilities (239) 14
Net cash used in operating activities (1,970) (500)
Investing activities:    
Acquisition of property and equipment (174) (36)
Net cash used in investing activities (174) (36)
Cash flows from financing activities:    
Proceeds from stock option exercises 364 315
Repurchase of common stock (296) (401)
Net cash provided by (used in) financing activities 68 (86)
Net cash provided by operating activities from discontinued operations 405 572
Net cash provided by in investing activities from discontinued operations 4,632 0
Effect of foreign exchange rate changes from discontinued operations 35 0
Net cash provided by discontinued operations 5,072 572
Net increase (decrease) in cash and cash equivalents 2,996 (50)
Cash and cash equivalents, beginning of period 10,789 [1] 8,347
Cash and cash equivalents, end of period 13,785 8,297
Cash paid during the period for:    
Income taxes 16 485
Interest paid $ 0 $ 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 31, 2011.