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Stock-Based Compensation (Details Textual) (USD $) |  |  |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  | 6 Months Ended | 12 Months Ended |  | 6 Months Ended |
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Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Employees And Directors [Member] | Jun. 30, 2012 Employees And Consultants [Member] | Jun. 30, 2013 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2012 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2013 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2012 Employees And Consultants [Member] General and Administrative Expenses and Research and Development Expense [Member] | Dec. 31, 2001 2001 Stock Plan [Member] | Jun. 30, 2013 2001 Stock Plan [Member] | Jun. 30, 2013 2007 Stock Plan [Member] | Dec. 31, 2007 2007 Stock Plan [Member] | Mar. 20, 2007 2007 Stock Plan [Member] | Jun. 30, 2013 2010 Stock Plan [Member] | Nov. 02, 2010 2010 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,860,136 | 4,453,746 | 2,979,010 |  |  |  |  |  |  |  | 953,507 |  |  | 2,500,000 | 2,463,056 | 3,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 117,500 | 1,550,000 |  |  |  |  | 250,000 |  | 443,573 | 250,000 |  | 2,463,056 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value |  |  |  | $ 185,000 | $ 3,500,000 |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  |  | 407,000 | 400,000 | 864,000 | 908,000 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $ 2,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair value of stock (or other type of equity) granted during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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