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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
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