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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
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