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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 27, 2014 | Sep. 28, 2013
Operating activities: |  |  |
Net income | $ 1,274 |  | $ 1,819
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 307 |  | 364
Change in fair value of earn-out liability | 303 |  | 181
Stock-based compensation expense | 722 |  | 511
Provision for doubtful accounts | 49 |  | 60
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (282) |  | (323)
Inventories | 1,001 |  | (1,963)
Prepaid expenses and other current assets | 28 |  | 595
Other long-term assets | 65 |  | 54
Accounts payable | (436) |  | (28)
Accrued compensation | (389) |  | (25)
Accrued expenses | (73) |  | 35
Accrued warranty | 70 |  | 19
Deferred revenue | 42 |  | 58
Other long-term liabilities | (21) |  |
Net cash provided by operating activities | 2,660 |  | 1,357
Investing activities: |  |  |
Acquisition of property and equipment | (472) |  | (235)
Payment on earn-out liability | (361) |  | (287)
Net cash used in investing activities | (833) |  | (522)
Financing activities: |  |  |
Proceeds from stock option exercises | 1,182 |  | 1,077
Repurchase of common stock | (3,411) |  | (194)
Payment of legal costs in connection with tender offer |  |  | (40)
Net cash (used in) provided by financing activities | (2,229) |  | 843
Net cash provided by investing activities from discontinued operations |  |  | 510
Net cash provided by discontinued operations |  |  | 510
Net (decrease) increase in cash and cash equivalents | (402) |  | 2,188
Cash and cash equivalents, beginning of period | 13,444 | [1] | 11,901
Cash and cash equivalents, end of period | 13,042 |  | 14,089
Cash paid during the period for: |  |  |
Income taxes | 47 |  | 12
Supplemental non-cash financing activities: |  |  |
Preferred stock conversion into common stock |  |  | $ 5
[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.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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