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Marketable Securities and Fair Value Measurements (Details Textual) (USD $) | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 First warrant [Member] | Mar. 31, 2012 First warrant [Member] | Mar. 31, 2013 Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2012 Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mar. 31, 2013 Using Significant Unobservable Inputs (Level 3) [Member] warrant | Sep. 30, 2011 Using Significant Unobservable Inputs (Level 3) [Member] First warrant [Member] | Mar. 31, 2012 Using Significant Unobservable Inputs (Level 3) [Member] Second warrant [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Number of shares held in an affiliated entity |  |  |  |  |  | 8,220,775 | 8,220,775 |  |  |
Number of warrants received to purchase shares of common stock |  |  |  |  |  |  |  | 2 |  |
Common stock purchase warrant |  |  |  |  |  |  |  |  | 1,000,000 | 3,000,000
Term of the warrants in years |  |  |  |  |  |  |  |  | 5 years | 5 years
Exercise price of a five-year warrant |  |  |  |  |  |  |  |  | $ 1.20 | $ 1.00
Long-term asset associated with warrants | $ 266,000 |  |  |  |  |  |  |  |  |
Gain on sale of asset | 501,000 |  |  |  |  |  |  |  |  |
Change in the fair value | 1,400,000 | 3,500,000 |  | (800) | (307,000) |  |  | 1,426,816 |  |
Expiration of warrants date range start |  |  |  |  |  |  |  | July 2014 |  |
Expiration of warrants date range end |  |  |  |  |  |  |  | September 2018 |  |
Common stock warrants | $ 10,254,959 |  | $ 2,859,899 |  |  |  |  |  |  |

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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + 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)(2)) -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 2 -Article 4 + Details
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