Condensed Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2020	Dec. 31, 2019
Stockholders' equity
Common stock, par value	$ .01	$ 0.01
Common stock, authorized	40,000,000	40,000,000
Common stock, issued	23,781,431	20,929,928
Common stock, outstanding	23,781,431	20,929,928