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Income Taxes (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Operating Loss Carryforwards [Line Items] |  |
AMT credit carryforwards | $ 500,000 |
Income Tax (Textual) [Abstract] |  |
Excess tax benefits from Employee Restricted Stock included in Net operating loss carryforwards | 500,000 |
Tax credit carryforwards, Expire year | 2027 |
Unrecognized tax benefits | 592,000 | 324,000
Valuation allowance |  | 53,200,000
Tax credits | 600,000 | 300,000
Valuation allowance recognized | 3,000,000 |
Interest and penalties | 38,000 |
Tax year under income tax examination | 2008 |
Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss, carryforward | 55,000,000 |
Net operating loss carryforward, expiry terms, Federal taxes | federal net operating loss carryforwards will expire from 2024 through 2031 |
Tax credit carryforwards | 3,400,000 |
Federal income tax returns subject to examination description | Federal income tax returns of the Company are subject to IRS examination for the 2008 through 2010 tax years. |
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating loss, carryforward | 83,400,000 |
Net operating loss carryforward, expiry terms, Federal taxes | state net operating loss carryforwards will expire 2015 through 2031 |
Tax credit carryforwards | $ 700,000 |
Federal income tax returns subject to examination description | State income tax returns are subject to examination for a period of three to four years after filing. |

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to research tax credits generated or utilized under enacted tax laws during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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