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Animal Health License Agreements (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Animal Health License Agreements [Abstract]      
Annual royalty expense $ 20,000    
License fees, quarterly 204,000    
Aggregate milestone payments, maximum 1,100,000    
Additional milestone payments, maximum 2,000,000    
Deferred revenue 1,182,000    
Deferred revenue 84,995   79,803
Deferred revenue, noncurrent 1,254,719   1,081,706
Other revenue - fee (Note 7) $ 18,655