Note 4 – Stock-based Compensation

We did not grant any stock options to our employees or non-employees during the six months ended June 30, 2020. During the six months ended June 30, 2019, we granted 129,919 stock options to employees and non-employees under the 2019 Omnibus Incentive Plan. At June 30, 2020, we had outstanding options to purchase 169,329 shares of our common stock of which options for the purchase of 56,853 shares of our common stock were vested. We recorded $192,532 and $125,035 of stock-based compensation expense for the six months ended June 30, 2020 and 2019, respectively.