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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders’ Equity
Preferred Stock

The Company has authorized up to 5,000,000 shares of preferred stock, $0.0001 par value per share, for issuance. There were no preferred shares outstanding as of December 31, 2021 and 2020.

Common Stock

The Company has authorized up to 350,000,000 shares of common stock, $0.0001 par value per share, for issuance.

On April 16, 2021, the Company entered into the Sales Agreement with Cantor Fitzgerald & Co. (the "Agent"). From time to time during the term of the Sales Agreement, the Company may offer and sell shares of common stock having an aggregate offering price up to a total of $50.0 million in gross proceeds. The Agent will collect a fee equal to 3% of the gross sales price of all shares of common stock sold. During the year ended December 31, 2021, the Company sold 786,927 shares of common stock pursuant to the Sales Agreement at an average price of $12.04 per share for aggregate net proceeds of approximately $9.0 million.
On December 13, 2020, the Company entered into a Securities Purchase Agreement with certain investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering by the Company directly to the investors (the “December 2020 Registered Direct Offering”), an aggregate of 2,320,000 shares of common stock, par value $0.0001 per share, of the Company, at an offering price of $7.00 per share for gross proceeds of approximately $16.2 million. The net proceeds to the Company from the December 2020 Registered Direct Offering, after deducting placement agent fees and related offering expenses, was approximately $15.0 million.

On July 31, 2020, the Company entered into a Securities Purchase Agreement with certain investors, pursuant to which the Company agreed to issue and sell, in a private placement directly to the investors (the "July 2020 PIPE Offering"), 2,744,078 shares of its common stock and accompanying warrants to purchase up to an aggregate of 2,744,078 shares of common stock at a combined purchase price of $3.335 per share and accompanying warrant. The warrants were immediately exercisable upon issuance at an exercise price of $3.30 per share and will expire five years from the date of issuance. The July 2020 PIPE Offering closed on August 4, 2020. The net proceeds to the Company from the July 2020 PIPE Offering, after deducting placement agent fees and related offering expenses, were approximately $8.5 million.

On January 9, 2020, the Company entered into a Securities Purchase Agreement with certain investors, pursuant to which the Company agreed to issue and sell, in a registered direct offering by the Company directly to the investors (the “January 2020 Registered Direct Offering”), (i) an aggregate of 1,189,000 shares of common stock, par value $0.0001 per share, of the Company, at an offering price of $3.9825 per share and (ii) an aggregate of 448,800 pre-funded warrants exercisable for shares of common stock at an offering price of $3.9725 per pre-funded warrant, for gross proceeds of approximately $6.5 million before deducting the placement agent fee and related offering expenses. In a concurrent private placement, the Company issued to the Investors who participated in the January 2020 Registered Offering warrants exercisable for up to an aggregate of 818,900 shares of common stock at an exercise price of $3.93 per share. Each warrant was immediately exercisable upon issuance and will expire five and one-half years from the issuance date. The net proceeds to the Company from the January 2020 Registered Direct Offering, after deducting placement agent fees and related offering expenses, and excluding the exercise of any warrants, was approximately $6.0 million.

Shares of common stock reserved for future issuance are as follows (in thousands):
 December 31, 2021
Warrants outstanding519 
Stock options outstanding534 
Restricted stock units outstanding200 
Options reserved for future issuance under the Company’s 2019 Equity Incentive Plan449 
Shares reserved for future issuance under the Employee Stock Purchase Plans311 
Total shares of common stock reserved for future issuance2,013