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Subsequent Events (Details Textual) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2013 sqft | Jan. 31, 2011 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 28, 2013 Subsequent Event [Member] | Dec. 31, 2012 Subsequent Event [Member]
Subsequent events (Textual) [Abstract] |  |  |  |  |  |  |  |
Number of shares of common stock |  |  |  | 2,700,000 |  |  | 782,755 |
Sale of stock, price per share |  | $ 10.00 |  | $ 2.12 | $ 2.47 | $ 11.60 | $ 2.06 |
Gross proceeds from common stock |  | $ 9,400,000 |  | $ 19,747,550 | $ 19,774,820 | $ 7,279,234 | $ 1,616,000 |
Sales agent is paid compensation equal to 3% of gross proceeds |  |  |  | 3.00% | 3.00% | 3.00% |  | 3.00%
Warrant exercise shares |  |  |  |  |  |  | 324,534 |
Warrant exercise price |  |  |  |  |  |  | 1.40 |
Proceeds from the exercise of warrants |  |  | 3,375,000 | 6,256,438 |  |  | 454,000 |
Warrant common stock share issued |  |  |  |  |  |  | 324,534 |
Commercial lease agreement of office and research space | 18,700 |  |  |  |  |  |  |
Initial term of lease | 10 years |  |  |  |  |  |  |
Initial term aggregate as rent over term of lease | $ 3,500,000 |  |  |  |  |  |  |

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- Definition The exercise price of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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