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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance, change in amount | $ (5.4) | $ 41.8 | $ (15.4)
Unrecognized tax benefits that would impact deferred tax assets and valuation allowance, and not impact effective tax rate | 8.5 |  |
Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 18.6 |  |
California and New Jersey Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 13.9 |  |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforward | 555.5 |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforward | 173.3 |  |
Realization Of Excess Tax Benefits From Share Based Compensation |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Excess Tax Benefits From Share Based Compensation, Amount Not Realized | 2.4 | 0.9 |
Valuation allowance, change in amount | $ 1.0 | $ 0 | $ 0.1

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- Definition Unrecognized Tax Benefits that Would Impact Deferred Tax Assets and Valuation Allowance, and Not Impact Effective Tax Rate + References No definition available. + Details
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- Definition Amount of operating loss carryforward, 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 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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- Definition The amount of the tax credit carryforward, 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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The amount of the change in the period in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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