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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013 | Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 10,624 | $ 9,743
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Amortization of deferred revenue | (1,835) | (1,837)
Depreciation | 985 | 927
Amortization of intangibles | 5,483 | 29
Amortization of premium and discount on investments, net | (219) | (437)
Stock-based employee compensation | 2,935 | 1,951
Stock-based compensation to Board of Directors and Scientific Advisory Board | 394 | 437
Retirement plan benefit expense | 834 | 777
(Increase) decrease in assets: |  |
Accounts receivable | (5,794) | 1,147
Inventory | 2,345 | (4,728)
Other current assets | (2,313) | (2,257)
Other assets | 2 | 10
(Decrease) increase in liabilities: |  |
Accounts payable and accrued expenses | (186) | 1,899
Other current liabilities | 904 | 205
Deferred revenue | 1,376 | 1,335
Net cash provided by operating activities | 15,535 | 9,201
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Purchase of property and equipment | (2,435) | (2,054)
Additions to intangibles | (107) | (18)
Purchase of investments | (185,314) | (177,449)
Proceeds from sale of investments | 175,093 | 220,552
Net cash (used in) provided by investing activities | (12,763) | 41,031
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from the issuance of common stock | 177 | 137
Repurchase of common stock | (5,456) | 0
Proceeds from the exercise of common stock options and warrants | 271 | 943
Payment of withholding taxes related to stock-based employee compensation | (2,985) | (3,508)
Net cash used in financing activities | (7,993) | (2,428)
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS | (5,221) | 47,804
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 85,923 | 111,795
CASH AND CASH EQUIVALENTS, END OF PERIOD | 80,702 |
The following non-cash activities occurred: |  |
Unrealized gain (loss) on available-for-sale securities | 36 | (39)
Common stock issued to Board of Directors and Scientific Advisory Board that was earned in a previous period | 300 | 328
Common stock issued to employees that was accrued for in a previous period, net of shares withheld for taxes | 282 | 252
Property, equipment and intangible invoices included in accounts payable | $ 891 | $ 0

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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + 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 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Section Appendix C -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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