Stockholders' equity	6 Months Ended
Jun. 30, 2021
Stockholders' equity
Stockholders' equity	5. Stockholders’ equity The total number of shares of all classes of capital stock that the Company is authorized to issue is 440,000,000 shares, consisting of 400,000,000 shares of common stock, par value $0.001 per share and 40,000,000 shares of preferred stock, par value $0.001 per share. Common Stock The holders of common stock are entitled to one vote for each share of common stock. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, after the payment or provision for payment of all debts and liabilities of the Company, the holders of common stock shall be entitled to share in the remaining assets of the Company available for distribution, if any. Shelf Registration Statement On November 12, 2020, the Company filed a universal shelf registration statement with the SEC for the issuance of common stock, preferred stock, warrants, rights, debt securities and units up to an aggregate of $350.0 million. On November 30, 2020, the Shelf Registration Statement was declared effective by the SEC. The universal shelf registration statement includes an at-the-market (“ATM”) offering program for the sale of up to $50.0 million of shares of the Company’s common stock. As of June 30, 2021, no sales of any equity or debt securities occurred under the ATM. Stock-Based Compensation Expense The Company recorded stock-based compensation expense of $1,863,498, and $3,686,060 for the three and six months ended June 30, 2021, respectively. The Company recorded stock-based compensation expense of $1,256,460 and $2,161,931 for the three and six months ended June 30, 2020, respectively. .

Stockholders' equity

6 Months Ended

Jun. 30, 2021

5. Stockholders’ equity

The total number of shares of all classes of capital stock that the Company is authorized to issue is 440,000,000 shares, consisting of 400,000,000 shares of common stock, par value $0.001 per share and 40,000,000 shares of preferred stock, par value $0.001 per share.

Common Stock

The holders of common stock are entitled to one vote for each share of common stock. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, after the payment or provision for payment of all debts and liabilities of the Company, the holders of common stock shall be entitled to share in the remaining assets of the Company available for distribution, if any.

Shelf Registration Statement

On November 12, 2020, the Company filed a universal shelf registration statement with the SEC for the issuance of common stock, preferred stock, warrants, rights, debt securities and units up to an aggregate of $350.0 million. On November 30, 2020, the Shelf Registration Statement was declared effective by the SEC. The universal shelf registration statement includes an at-the-market (“ATM”) offering program for the sale of up to $50.0 million of shares of the Company’s common stock. As of June 30, 2021, no sales of any equity or debt securities occurred under the ATM.

Stock-Based Compensation Expense

The Company recorded stock-based compensation expense of $1,863,498, and $3,686,060 for the three and six months ended June 30, 2021, respectively. The Company recorded stock-based compensation expense of $1,256,460 and $2,161,931 for the three and six months ended June 30, 2020, respectively.