Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets
Patent costs, accumulated amortization	$ 972,553	$ 953,491
Trademark costs, accumulated amortization	89,877	85,381
Deferred financing costs	7,772	0
Deferred financing costs	$ 0	$ 45,079
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	54,267,440	54,108,510
Common stock, shares outstanding	54,267,440	54,108,510