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Capital Stock
 3 Months Ended
Mar. 31, 2023
Equity [Abstract]  
Capital Stock Capital Stock
Exercise of Options
For the three months ended March 31, 2023 and March 31, 2022, we issued 142,856 and 77,600 shares, respectively, upon option exercises at a weighted-average exercise price of $1.97 and $2.33 per share, respectively, with net cash proceeds of $0.3 million and $0.2 million, respectively.
Equity Distribution Agreement
In May 2021, we filed a Registration Statement on Form S-3 with the SEC, that automatically became effective upon its filing, under which we may sell common stock, preferred stock, debt securities, warrants, purchase contracts, and units from time to time in one or more offerings. On February 27, 2023, we filed a post-effective amendment to that Registration on Form S-3. Pursuant to that post-effective amendment, we registered an aggregate $200.0 million of securities. In May 2021, we entered into an Equity Distribution Agreement ("EDA") with Piper Sandler & Co ("PSC"), under which PSC, as our exclusive agent, at our discretion and at such times that we may determine from time to time, may sell over a three-year period from the execution of the EDA up to a maximum of $50.0 million of shares of our common stock. Under the terms of the EDA, PSC may sell the shares at market prices by any method that is deemed to be an "at the market offering" as defined in Rule 415 under the Securities Act of 1933, as amended.
We are not required to sell any shares at any time during the term of the EDA. The EDA will terminate upon the earlier of: (i) the issuance and sale of all shares through PSC on the terms and conditions of the EDA, or (ii) the termination of the EDA in accordance with its terms. Either party may terminate the EDA at any time upon written notification to the other party in accordance with the EDA, and upon such notification, the offering will terminate. Under no circumstances shall any shares be sold pursuant to the EDA after the date which is three years after the registration statement is first declared effective by the SEC. We agreed to pay PSC a commission of 3% of the gross sales price of any shares sold pursuant to the EDA. With the exception of certain expenses, we will pay PSC up to 8% of the gross sales price of the shares sold pursuant to the EDA for a combined amount of commission and reimbursement of PSC's expenses and fees.
During the three months ended March 31, 2023, 327,480 shares of our common stock were issued pursuant to the EDA. We received gross proceeds of $1.5 million, or $1.2 million in net proceeds after PSC's commissions and direct offering expenses of $0.4 million. As of March 31, 2023, $48.5 million worth of shares remained available for sale under the EDA. During the three months ended March 31, 2022, no shares of our common stock were issued pursuant to the EDA.