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Stock Purchase Warrants (Details Textual) (USD $) | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2013 | Oct. 25, 2012 Warrant [Member] | Mar. 15, 2012 Warrant [Member] | Feb. 02, 2012 Warrant [Member] | Jun. 30, 2013 Warrant [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2012 Warrant [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2013 Warrant [Member] General and Administrative Expenses and Research and Development Expense [Member] | Jun. 30, 2012 Warrant [Member] General and Administrative Expenses and Research and Development Expense [Member]
Issuance of Warrants to Purchase of Common Stock |  | 635,855 |  |  |  |  |  |
Warrants Exercise Price Per Share |  | $ 1.60 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Remaining Contractual Terms | 3 years 3 months 11 days | 5 years |  |  |  |  |  |
Investment Warrants Expiration Date |  | Oct. 25, 2017 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Exercisable Number |  |  | 250,000 | 100,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Vested and Expected to Vest Outstanding, Number |  |  | 50,000 |  |  |  |  |
Incremental Expense |  |  | $ 76,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Exercisable in Period |  |  | 2 years | 5 years |  |  |  |
Warrants Exercisable Price Per Share |  |  | $ 2.20 | $ 1.14 |  |  |  |
Allocated Share-based Compensation Expense |  |  |  |  | $ 22,000 | $ 0 | $ 22,000 | $ 270,000

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- Definition Expiration date of warrants held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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- Definition This element represents incremental expense related to the modification of the warrants. + References No definition available. + Details
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- Definition Warrants issued to purchase common stock. + References No definition available. + Details
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- Definition Exercisable term of warrants. + References No definition available. + Details
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- Definition The number of exercisable share warrants that may be converted as of the balance sheet date. + References No definition available. + Details
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- Definition As of the balance sheet date, the number of Warrants into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References No definition available. + Details
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- Definition Warrants exercisable price per share. + References No definition available. + Details
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- Definition per share amount of the warrant. + 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 Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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