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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cash flows from operating activities: |  |
Net income | $ 490 | $ 731
Adjustments to reconcile net income to net cash provided by (used in) operations: |  |
Depreciation and amortization expense | 319 | 323
Amortization of deferred rent | (21) | (15)
Stock-based compensation expense | 84 | 59
Provision for (recoveries of) doubtful accounts, net | (27) | 27
Inventory valuation reserve adjustments | 416 | (34)
Loss on disposal of assets | 2 | 0
Tax benefit from exercise of stock options | (87) | 0
Changes in operating assets and liabilities: |  |
Receivables | 853 | 434
Inventories | 40 | (555)
Deferred income taxes | 44 | 0
Prepaid expenses and other assets | 886 | (138)
Accounts payable | 178 | 1,410
Accrued liabilities | 210 | (144)
Income taxes payable | 235 | (15,066)
Deferred product revenue | (51) | 599
Net cash provided by (used in) operating activities | 3,571 | (12,369)
Cash flows from investing activities: |  |
Payment towards business acquisitions | (13,048) | 0
Purchase of property and equipment | (249) | (62)
Purchase of Patents | (90) | 0
Purchases of marketable securities | (780) | 0
Net cash (used in) investing activities | (14,167) | (62)
Cash flows from financing activities: |  |
Proceeds from the exercise of stock options | 1,021 | 76
Tax benefits from stock options | 87 | 0
Payments of Stock Issuance Costs | (55) | 0
Treasury stock purchased | 0 | (574)
Net cash provided by (used in) financing activities | 1,053 | (498)
Net (decrease) in cash and cash equivalents | (9,543) | (12,929)
Cash and cash equivalents at the beginning of the period | 17,192 | 55,509
Cash and cash equivalents at the end of the period | 7,649 | 42,580
Supplemental disclosure of cash flow information: |  |
Cash paid for income taxes | 29 | 15,346
Non-cash investing and financing activities: |  |
Business Combination, Consideration Transferred | 10,381 |
Common Stock [Member] |  |
Non-cash investing and financing activities: |  |
Business Combination, Consideration Transferred | $ 1,679 | $ 0

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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