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Capital Stock | 3 Months Ended
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Mar. 31, 2023
Capital Stock |
Capital Stock | 11. Capital Stock Dividends During the three months ended March 31, 2023, the Company’s Board of Directors declared and paid cash dividends on the Company’s Series A Preferred Stock and Series B Depositary shares as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Series A Preferred Stock | ​ | Series B Depositary Share | ​ | ​
​ | ​ | Cash Dividend Declared | ​ | Cash Dividend Declared | ​ | ​
Dividend Declaration Date |  | ($ per share) |  | ($ per share) |  | Dividend Payment Date
October 26, 2022 | ​ | $ | 0.53906 | ​ | $ | 0.52344 | ​ | January 17, 2023
February 22, 2023 | ​ | $ | 0.53906 | ​ | $ | 0.52344 | ​ | April 17, 2023
​ BVF Ownership As of March 31, 2023, BVF owned approximately 31.7% of the Company’s total outstanding shares of common stock, and if all the Series X convertible preferred shares were converted, BVF would own 52.5% of the Company’s total outstanding shares of common stock. The Company’s Series A Preferred Stock becomes convertible upon the occurrence of specific events and as of March 31, 2023, the contingency was not met, therefore the Series A Preferred Stock owned by BVF is not included in the as-converted ownership calculation. Due to its significant equity ownership, BVF is considered a related party of the Company. 2018 Common Stock ATM Agreement On December 18, 2018, the Company entered into the 2018 Common Stock ATM Agreement with HCW, under which the Company may offer and sell from time to time at its sole discretion shares of its common stock through HCW as its sales agent, in an aggregate amount not to exceed $30.0 million. HCW may sell the shares by any method permitted by law deemed to be an “at the market” offering as defined in Rule 415 of the Securities Act and will use its commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares up to the amount specified. The Company will pay HCW a commission of up to 3% of the gross proceeds of any shares of common stock sold under the 2018 Common Stock ATM Agreement. On March 10, 2021, the Company amended the 2018 Common Stock ATM Agreement with HCW to increase the aggregate amount of shares of its common stock that it could sell through HCW as its sales agent to $50.0 million. No shares have been sold under the 2018 Common Stock ATM Agreement since the agreement was executed. 2021 Series B Preferred Stock ATM Agreement On August 5, 2021, the Company entered into the 2021 Series B Preferred Stock ATM Agreement with B. Riley, under which the Company may offer and sell from time to time, at its sole discretion, through or to B. Riley, as agent or principal an aggregate amount not to exceed $50.0 million of its Series B Depositary Shares. B. Riley may sell the shares by any method permitted by law deemed to be an “at the market” offering as defined in Rule 415 of the Securities Act and will use its commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares up to the amount specified. The Company will pay B. Riley a commission of up to 3% of the gross proceeds of any Series B Depositary Shares sold under the 2021 Series B Preferred Stock ATM Agreement. No shares have been sold under the 2021 Series B Preferred Stock ATM Agreement since the agreement was executed.

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