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Marketable Securities and Fair Value Measurements (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended | 1 Months Ended
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Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 Onco Sec Common Stock Warrants [Member] | Sep. 30, 2012 Onco Sec Common Stock Warrants [Member] | Sep. 30, 2013 Onco Sec Common Stock Warrants [Member] | Sep. 30, 2012 Onco Sec Common Stock Warrants [Member] | Sep. 30, 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] | Sep. 30, 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]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised |  |  |  | 20,584,997 |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 245,000 |  | $ 245,000 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of asset | 501,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in the fair value |  | 34,900,000 | 1,100,000 | 39,600,000 | 987,000 |  | (21,000) | 11,000 | (22,000) | (80,000) |  |  | 39,557,404 |  |
Common stock warrants |  | $ 14,095,818 |  | $ 14,095,818 |  | $ 2,859,899 |  |  |  |  |  |  |  |  |

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- Definition Class of Warrant or Right, Term + References No definition available. + Details
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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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