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Summary of Significant Accounting Policies (Details Textual) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Jul. 31, 2011
Nov. 30, 2009
Nov. 30, 2008
Dec. 31, 2012
Segment
Dec. 31, 2011
Dec. 31, 2010
Jul. 06, 2011
Dec. 31, 2012
Cash equivalents [Member]
Maximum [Member]
Dec. 31, 2012
Marketable securities, current [Member]
Minimum [Member]
Dec. 31, 2012
Marketable securities, non-current [Member]
Maximum [Member]
Dec. 31, 2011
Series A [Member]
Jun. 30, 2012
Series A [Member]
Mar. 31, 2012
Series A [Member]
May 02, 2012
Series B [Member]
Dec. 31, 2011
Series B [Member]
Jun. 30, 2012
Series B [Member]
Mar. 31, 2012
Series B [Member]
Jul. 31, 2011
Reverse stock split [Member]
Jul. 06, 2011
Reverse stock split [Member]
Summary of significant accounting policies (Textual) [Abstract]                                      
Outstanding shares of common stock       37,506,305 22,427,955                           139,000,000
Reduced common stock shares outstanding                                   13,900,000  
Previous number of common shares authorized             250,000,000                        
Shares authorized       75,000,000 75,000,000                           75,000,000
Investments with maturities               90 days or less from the date of purchase [1] 365 days or less greater than 365 days                  
Term of warrant     5 years               5 years       90 days        
Per share of common stock   $ 15.00 $ 23.00               $ 1.40       $ 1.25        
Impairment of goodwill       $ 0                              
Value of patent       0                              
Accumulated other comprehensive income       193,177 40,713                            
Number of Warrants exercised                               2,700,000 2,700,000    
Number of warrants issued on exercise of warrants                       2,700,000 2,700,000            
Number of warrants expired by terms                           5,300,000          
Repurchase of common stock   400,000 1,034,483               8,000,000       8,000,000        
Summary of Significant Accounting Policies (Additional Textual) [Abstract]                                      
Number of Segments       1                              
Reverse stock split 1-for-10                                    
Reverse stock split, ratio 0.1                                    
Accumulated deficit       (361,091,175) (332,600,022)                            
Goodwill       1,983,426 1,895,000                            
Intangible assets with finite useful lives       1,823,000                              
Intangible asset impaired and wrote off carrying value of the asset         654,961                            
Fair value of certain lab equipment       28,000   63,000                          
Written off unamortized amount of license agreement           $ 67,000                          
Common stock per unit       $ 1                              
Warrants issued per unit       $ 1                              
[1] In September 2012, we issued 24,753 shares of restricted common stock under the terms of an agreement with a developer of biological materials in return for certain product rights including an exclusive right of first offer to commercialize the developer's products as may be developed on or before April 18, 2017.