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Marketable Securities and Fair Value Measurements (Details Textual) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Onco Sec Common Stock Warrants [Member]
Sep. 30, 2013
Onco Sec Common Stock Warrants [Member]
Sep. 30, 2014
Onco Sec Common Stock Warrants [Member]
Sep. 30, 2013
Onco Sec Common Stock Warrants [Member]
Sep. 30, 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]
Sep. 30, 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    
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 $ 591,000   $ 591,000                      
Increase (decrease) in fair value included in change in fair value of common stock warrants (176,000) 34,900,000 (331,000) 39,600,000   (290,000) (21,000) (127,000) (22,000)     (330,984)    
Number of common stock issued related to warrants exercised 97,865   2,169,342                      
Common stock warrants $ 2,207,388   $ 2,207,388   $ 19,540,583