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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.

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