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Marketable Securities and Fair Value Measurements (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
First warrant [Member]
Jun. 30, 2012
First warrant [Member]
Jun. 30, 2012
Second warrant [Member]
Jun. 30, 2012
Second warrant [Member]
Jun. 30, 2012
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Dec. 31, 2011
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Jun. 30, 2012
Using Significant Unobservable Inputs (Level 3) [Member]
Sep. 30, 2012
Using Significant Unobservable Inputs (Level 3) [Member]
First warrant [Member]
Jun. 30, 2012
Using Significant Unobservable Inputs (Level 3) [Member]
First warrant [Member]
Dec. 31, 2011
Using Significant Unobservable Inputs (Level 3) [Member]
First warrant [Member]
Mar. 31, 2012
Using Significant Unobservable Inputs (Level 3) [Member]
First warrant [Member]
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]
Jun. 30, 2012
Using Significant Unobservable Inputs (Level 3) [Member]
Second warrant [Member]
Dec. 31, 2011
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                  
Common stock purchase warrant                               1,000,000 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    
Increase (decrease) in the fair value of warrant $ 3,400,000 $ 4,900,000 $ 138,000 $ 7,200,000   $ 216,000 $ (91,000) $ 0 $ 0     $ (137,809)                
Expiration of warrants date range start                       July 2014                
Expiration of warrants date range end                       December 2016                
Marketable Securities and Fair Value Measurements (Additional Textual) [Abstract]                                        
Long-term asset associated with warrants 510,000   510,000                                  
Gain on sale of asset     501,000                                  
Common stock warrants $ 5,038,510   $ 5,038,510   $ 5,176,319