v2.4.0.6

Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 359,000,000 | $ 311,000,000 |
Deferred revenues | 56,000,000 | 63,000,000 |
Capitalized research and development expenditures | 35,000,000 | 34,000,000 |
Research and development tax credit carryforwards | 37,000,000 | 34,000,000 |
Other | 31,000,000 | 26,000,000 |
Valuation allowance | (518,000,000) | (468,000,000) |
Information related to valuation allowance |  |  |
Increase in valuation allowance | 50,000,000 | 35,000,000 | 32,000,000
Gross unrecognized tax benefits |  |  |
Gross unrecognized tax benefits at the beginning of the period | 42,600,000 | 39,600,000 | 36,200,000
Gross decrease for tax positions for prior years |  |  | (100,000)
Gross increase in tax positions for current year | 4,300,000 | 3,000,000 | 3,500,000
Gross unrecognized tax benefits at the end of the period | 46,900,000 | 42,600,000 | 39,600,000
Federal |  |  |
Operating Loss and Tax Credit Carryforward [Line Items] |  |  |
Net operating loss carryfowards | 1,068,200,000 |  |
Federal | Research and Development |  |  |
Operating Loss and Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward amount | 43,200,000 |  |
State |  |  |
Operating Loss and Tax Credit Carryforward [Line Items] |  |  |
Net operating loss carryfowards | 425,000,000 |  |
State | Research |  |  |
Operating Loss and Tax Credit Carryforward [Line Items] |  |  |
Tax credit carryforward amount | $ 46,900,000 |  |

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- Definition The tax effect as of the balance sheet date of the amount of future tax deductions arising from unused research and development tax credit carryforwards; a tax credit carryforward is the amount by which tax credits available for utilization exceed statutory limitations for inclusion in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization. + References No definition available. + Details
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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to income recognized only for tax purposes and which will reverse when recognized under generally accepted accounting principles. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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 109 -Paragraph 11 -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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- Definition The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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