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Accounts Receivable
9 Months Ended
Sep. 30, 2011
Notes to Financial Statements [Abstract] 
Accounts Receivable
5.  Accounts Receivable

   
September 30,
2011
  
December 31,
2010
 
Collaborators
 $709  $1,811 
Royalties
  1,240   - 
National Institutes of Health
  538   468 
Other
  25   4 
Total
 $2,512  $2,283