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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, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 First warrant [Member] | Mar. 31, 2013 First warrant [Member] | Mar. 31, 2014 Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Dec. 31, 2013 Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mar. 31, 2014 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 |  |
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 | $ 1,400,000 |  |  |  |  |  |  |  |  |
Increase (Decrease) in fair value of warrants | 1,200,000 | 1,400,000 |  | 693,000 | (800) |  |  | (14,693,106) |  |
Expiration of warrants date range start |  |  |  |  |  |  |  | July 2014 |  |
Expiration of warrants date range end |  |  |  |  |  |  |  | September 2018 |  |
Common stock purchase warrant |  |  |  |  |  |  |  | 7,604,091 | 1,000,000 | 3,000,000
Common stock warrants | $ 6,045,903 |  | $ 19,540,583 |  |  |  |  |  |  |

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- Definition Number of warrants received to purchase shares of common stock. + References No definition available. + Details
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- Definition Exercise price of the warrants. + 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 Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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=26873400&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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