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Income Taxes (Details Textual) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes (Additional Textual) [Abstract] |  |  |
Unrecognized tax benefits | $ 0 | $ 0 |
Increase in valuation allowances | 864,000 | 7,871,000 | 7,030,000
Tax liabilities | 0 |  |
Tax related interest | 0 |  |
Tax related penalties | 0 |  |
Decrease in state deferred income taxes | 5,000,000 |  |
Research and development [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Credit research expiry date | Dec. 31, 2011 |  |
Credit research expiry extended date | Jan. 01, 2014 |  |
Research deferred tax carryforward amount | 400,000 |  |
Domestic Tax Authority [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Net operating loss carryforward | 143,909,000 |  |
Operating loss carryforward expiration period description | 2018 through 2032 |  |
Domestic Tax Authority [Member] | Research and development [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Research and development tax credits | 4,846,000 |  |
Operating loss carryforward expiration period description | 2018 through 2031 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Net operating loss carryforward | 47,105,000 |  |
Operating loss carryforward expiration period description | 2013 through 2032 |  |
State and Local Jurisdiction [Member] | Research and development [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Research and development tax credits | 4,441,000 |  |
State research and development tax credits net of federal tax effect | 2,931,000 |  |
Foreign Tax Authority [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Net operating loss carryforward | 11,713,000 |  |
Domestic and State [Member] | Capital Loss Carryforward [Member] |  |  |
Income Taxes (Textual) [Abstract] |  |  |
Capital loss carry forward for federal and state income tax purposes | $ 1,592,000 |  |
Operating loss carryforward expiration period description | 2014 through 2016 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax liability to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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