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Marketable Securities and Fair Value Measurements (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended | 1 Months Ended
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Mar. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 Onco Sec Common Stock Warrants [Member] | Jun. 30, 2012 Onco Sec Common Stock Warrants [Member] | Jun. 30, 2013 Onco Sec Common Stock Warrants [Member] | Jun. 30, 2012 Onco Sec Common Stock Warrants [Member] | Jun. 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] | Jun. 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]
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 |  | $ 266,000 |  |  |  |  |  |  |  |  |  |  |
Gain on sale of asset | 501,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in the fair value |  | 3,200,000 | 3,400,000 | 4,600,000 | 100,000 |  | (1,000) | (216,000) | (2,000) | 91,000 |  |  | 4,625,794 |  |
Expiration of warrants date range start |  |  |  |  |  |  |  |  |  |  |  |  | July 2014 |  |
Expiration of warrants date range end |  |  |  |  |  |  |  |  |  |  |  |  | September 2018 |  |
Common stock warrants |  | $ 13,453,937 |  | $ 13,453,937 |  | $ 2,859,899 |  |  |  |  |  |  |  |  |

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