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COMMON STOCK | 6 Months Ended
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Jun. 30, 2021
COMMON STOCK. |
COMMON STOCK | 7. COMMON STOCK Common Stock Issued, Net of Issuance Costs December 2020 Purchase Agreement with Lincoln Park Capital Fund, LLC On December 4, 2020, the Company entered into a Purchase Agreement with Lincoln Park (the “December 2020 PA”) to place up to $100.0 million in the aggregate of the Company's common stock on an ongoing basis when required by the Company over a term of 36 months. The Company controls the timing and amount of any sales to Lincoln Park, and Lincoln Park is obligated to make purchases in accordance with the December 2020 PA. Any common stock that is sold to Lincoln Park will occur at a purchase price that is based on an agreed upon fixed discount to the Company's prevailing market prices at the time of each sale and with no upper limits to the price Lincoln Park may pay to purchase common stock. The agreement may be terminated by the Company at any time, in its sole discretion, without any additional cost or penalty. The December 2020 PA specifically provides that the Company may not issue or sell any shares of its common stock under the agreement if such issuance or sale would breach any applicable rules of the NYSE American Stock Exchange (“NYSE American”). In particular, NYSE American General Rule 713(a) provides that the Company may not issue or sell more than 19.99% of the number of shares of the Company’s common stock that were outstanding immediately prior to the execution of the December 2020 PA unless (i) shareholder approval is obtained or (ii) the average price of all applicable sales of common stock to Lincoln Park under the December 2020 PA, equals or exceeds $6.15. The Company held its 2021 Annual Shareholders Meeting on May 21, 2021 and obtained shareholder approval for the issuance of more than 19.99% of the shares of the Company’s common stock outstanding. Lincoln Park has no right to require the Company to sell any shares of common stock to Lincoln Park, but Lincoln Park is obligated to make purchases as the Company directs, subject to certain conditions. In all instances, the Company may not sell shares of its common stock to Lincoln Park under the December 2020 PA if it would result in Lincoln Park beneficially owning more than 9.99% of its common stock at any one point in time. During the three and six months ended June 30, 2021, pursuant to the December 2020 PA with Lincoln Park, the Company sold 1.2 million and 5.0 million shares of common stock respectively, for net proceeds of $5.7 million and $30.6 million, respectively. These shares were sold pursuant to a Form S-3 registration statement filed pursuant to Rule 424(b)(3) and declared effective by the Securities and Exchange Commission on December 4, 2020. ​ ATM Offering Agreement with Cantor On April 14, 2017, the Company entered into a Controlled Equity OfferingSM Sales Agreement (the “ATM Offering Agreement”) with Cantor acting as sales agent. Under the ATM Offering Agreement, the Company may from time to time sell shares of its common stock in “at-the-market” offerings. The Company pays Cantor a commission of up to 2.5% of the gross proceeds from the sale of any shares pursuant to the ATM Offering Agreement. ​ During the six months ended June 30, 2021, the Company sold 9.3 million shares of common stock for net proceeds of $47.3 million pursuant to the ATM Offering Agreement with Cantor. These shares were sold pursuant to a prospectus supplement filed on December 4, 2020, pursuant to Rule 424(b)(5) as a takedown off the Company’s shelf registration statement which had been declared effective by the Securities and Exchange Commission on December 1, 2020. The Company did not sell any shares of common stock pursuant to the ATM Offering Agreement for the three months ended June 30, 2021. As of June 30, 2021, the Company has no shares of common stock registered for sale under the ATM Offering Agreement. ​ Warrants The following table summarizes warrants outstanding and changes for the six-month periods ending June 30, 2021, and 2020: ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | June 30, 2020
​ |  | ​ |  | ​
​ | ​ | Number of | ​ | Number of
​ | ​ | Warrants | ​ | Warrants
Warrants outstanding at beginning of period |  | — |  | 197,622
Issued |  | — |  | —
Expired |  | — |  | (11,440)
Warrants outstanding at end of period |  | — |  | 186,182
​ ​ ​ ​ ​ On October 6, 2020, a warrant holder of 182,515 warrants provided notice of exercise. The warrant holder elected the cashless exercise method to convert the warrants to shares of common stock. Based on the cashless exercise formula, the Company issued the warrant holder 118,799 shares of common stock.

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