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Deferred charges
12 Months Ended
Dec. 31, 2012
Deferred Charges [Abstract]  
Deferred Charges

5. Deferred charges

Under the terms of the Amended and Restated License Agreement with Harvard, total license fees of $66,050 are due to Harvard related to the cash and stock consideration received from the sublicense agreement with Navidea The Company is amortizing those license fees on a straight-line basis over the estimated performance period which is the effective date of the agreements on July 31, 2012 through the patent expiration date in June 2030.