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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Cash flows from operating activities: |  |  |
Net income (loss) | $ 21,337 | $ 9,634 | $ (5,936)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Depreciation and amortization | 10,299 | 9,052 | 9,794
Stock based compensation | 5,458 | 5,493 | 4,041
Amortization of premiums, accretion of discounts and accrued interest on available-for-sale marketable securities, net | 3,652 | 1,877 | 1,765
Accrued interest on bank deposits | (243) | (137) | (130)
Accrued severance pay, net | (59) | (591) | (703)
Decrease (increase) in deferred income taxes, net | (1,358) | (5) | 1
Decrease (increase) in trade receivables, net | 3,978 | 60 | (3,255)
Decrease (increase) in other current assets and prepaid expenses | 365 | (468) | (888)
Decrease (increase) in inventories | (2,425) | 70 | (561)
Increase (decrease) in trade payables | (814) | 214 | 1,053
Increase in deferred revenues | 977 | 13,358 | 8,807
Increase in other payables and accrued expenses | 1,613 | 2,409 | 1,338
Excess tax benefit from stock-based compensation | (790) |  | (899)
Net cash provided by operating activities | 41,990 | 40,966 | 14,427
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (5,734) | (5,650) | (5,837)
Investment in other long-term assets | (35) | (88) | (36)
Investment in bank deposits | (32,089) | (21,174) | (35,000)
Purchase of available-for-sale marketable securities | (68,777) | (75,814) | (405,827)
Proceeds from redemption and maturity of available-for-sale marketable securities | 57,423 | 37,201 | 440,575
Payment for the acquisition of Intangible assets |  | (1,200) |
Payment for the acquisition of Alteon |  |  | (18,022)
Net cash used in investing activities | (49,212) | (66,725) | (24,147)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 8,534 | 21,200 | 1,018
Excess tax benefit from stock-based compensation | 790 |  | 899
Repurchase of shares |  |  | (419)
Net cash provided by financing activities | 9,324 | 21,200 | 1,498
Increase (decrease) in cash and cash equivalents | 2,102 | (4,559) | (8,222)
Cash and cash equivalents at the beginning of the year | 15,284 | 19,843 | 28,065
Cash and cash equivalents at the end of the year | 17,386 | 15,284 | 19,843
Supplemental disclosure of cash flow information: |  |  |
Cash paid during the year for income taxes | $ 847 | $ 719 | $ 383

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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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 Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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