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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Operating activities:    
Net income $ 487 $ 874
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 108 126
Change in fair value of earn-out liability 99 19
Stock-based compensation expense 244 161
Provision for doubtful accounts 10 54
Changes in operating assets and liabilities, net of assets and liabilities acquired:    
Accounts receivable 603 (605)
Inventories 747 (112)
Prepaid expenses and other current assets (154) 6
Other long-term assets 15 (11)
Accounts payable (508) (825)
Accrued compensation (493) (121)
Accrued expenses (582) 108
Accrued warranty 16 (7)
Deferred revenue (49) (61)
Other long-term liabilities 102 (12)
Net cash provided by (used in) operating activities 645 (406)
Investing activities:    
Acquisition of property and equipment (108) (18)
Payment on earn-out liability (94) (83)
Net cash used in investing activities (202) (101)
Financing activities:    
Proceeds from stock option exercises 329 273
Repurchase of common stock (247) (46)
Payment of legal costs in connection with tender offer   (40)
Net cash provided by financing activities 82 187
Net increase (decrease) in cash and cash equivalents 525 (320)
Cash and cash equivalents, beginning of period 13,444 [1] 11,901
Cash and cash equivalents, end of period 13,969 11,581
Cash paid during the period for:    
Income taxes 4 10
Supplemental non-cash financing activities:    
Accrual for unsettled repurchases of common stock $ 99  
[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2013.