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Unaudited Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2018 $ 43,159 $ 405,972,075 $ (200,550,739) $ 205,464,495
Balance, shares at Dec. 31, 2018 43,160,751      
Exercise of options $ 20 30,534   30,554
Exercise of options, shares 19,418      
Stock-based compensation   1,382,443   1,382,443
Net loss     (14,083,897) (14,083,897)
Balance at Mar. 31, 2019 $ 43,179 407,385,052 (214,634,636) 192,793,595
Balance, shares at Mar. 31, 2019 43,180,169      
Balance at Dec. 31, 2019 $ 43,465 412,599,772 (258,442,650) 154,200,587
Balance, shares at Dec. 31, 2019 43,466,933      
Exercise of options $ 116 129,856   129,972
Exercise of options, shares 116,046      
Stock-based compensation   1,822,148   1,822,148
Net loss     (7,662,604) (7,662,604)
Balance at Mar. 31, 2020 $ 43,581 $ 414,551,776 $ (266,105,254) $ 148,490,103
Balance, shares at Mar. 31, 2020 43,582,979