Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 12,000	$ 5,000
Preferred stock, par value	$ 1.00	$ 1.00
Preferred stock, shares authorized	300,000	300,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	67,353,690	61,044,698
Common stock, shares outstanding	67,353,690	61,044,698