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Shareholders’ equity | 6 Months Ended
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Jun. 30, 2023
Stockholders' Equity Note [Abstract] |
Shareholders’ equity | Shareholders’ equity Authorized share capital The Company’s authorized share capital consists of an unlimited number of common shares and preferred shares, without par value, and 1,164,000 Series A participating convertible preferred shares, without par value. Open Market Sale Agreement The Company has an Open Market Sale Agreement with Jefferies LLC dated December 20, 2018, as amended by Amendment No. 1, dated December 20, 2019, Amendment No. 2, dated August 7, 2020 and Amendment No. 3, dated March 4, 2021 (as amended, the “Sale Agreement”), under which the Company may issue and sell common shares, from time to time. On December 23, 2019, the Company filed a shelf registration statement on Form S-3 with the Securities and Exchange Commission (the “SEC”) (File No. 333-235674) and accompanying base prospectus, which was declared effective by the SEC on January 10, 2020 (the “January 2020 Registration Statement”), for the offer and sale of up to $150.0 million of the Company’s securities. The January 2020 Registration Statement also contained a prospectus supplement for an offering of up to $50.0 million of the Company’s common shares pursuant to the Sale Agreement. This prospectus supplement was fully utilized during 2020. On August 7, 2020, the Company filed a prospectus supplement with the SEC (the “August 2020 Prospectus Supplement”) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the January 2020 Registration Statement. The August 2020 Prospectus Supplement was fully utilized during 2020. On August 28, 2020, the Company filed a shelf registration statement on Form S-3 with the SEC (File No. 333-248467) and accompanying base prospectus, which was declared effective by the SEC on October 22, 2020 (the “October 2020 Registration Statement”), for the offer and sale of up to $200.0 million of the Company’s securities. On March 4, 2021, the Company filed a prospectus supplement with the SEC (the “March 2021 Prospectus Supplement”) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the October 2020 Registration Statement. The March 2021 Prospectus Supplement was fully utilized during 2021. On October 8, 2021, the Company filed a prospectus supplement with the SEC (the “October 2021 Prospectus Supplement”) for an offering of up to an additional $75.0 million of its common shares pursuant to the Sale Agreement under the October 2020 Registration Statement. On November 4, 2021, the Company filed a shelf registration statement on Form S-3 with the SEC (File No. 333-260782) and accompanying base prospectus, which was declared effective by the SEC on November 18, 2021 (the “November 2021 Registration Statement”), for the offer and sale of up to $250.0 million of the Company’s securities. On March 3, 2022, the Company filed a prospectus supplement with the SEC (the “March 2022 Prospectus Supplement”) for an offering of up to an additional $100.0 million of its common shares pursuant to the Sale Agreement under: (i) the January 2020 Registration Statement; (ii) the October 2020 Registration Statement; and (iii) the November 2021 Registration Statement. During the three and six months ended June 30, 2023, the Company issued 1,790,546 and 9,214,168 common shares pursuant to the Sale Agreement, respectively, resulting in net proceeds of approximately $4.7 million and $24.6 million, respectively. During the three and six months ended June 30, 2022, the Company issued 69,048 common shares pursuant to the Sale Agreement, resulting in net proceeds of $0.3 million. As of June 30, 2023, there was approximately $105.8 million of common shares remaining available in aggregate under the October 2021 Prospectus Supplement and the March 2022 Prospectus Supplement. Stock-based compensation The table below summarizes information about the Company’s stock-based compensation for the three and six months ended June 30, 2023 and 2022 and the expense recognized in the condensed consolidated statements of operations:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
| (in thousands, except share and per share data)
Stock options |  |  |  |  |  |  |
Options granted during period | 547,600 |  |  | 362,280 |  |  | 4,298,400 |  |  | 4,734,575 |
Weighted average exercise price | $ | 2.75 |  |  | $ | 2.33 |  |  | $ | 2.88 |  |  | $ | 2.78 |
Restricted stock units (“RSUs”) |  |  |  |  |  |  |
Restricted stock units granted during period | — |  |  | — |  |  | 1,344,550 |  |  | — |
Grant date fair value | $ | — |  |  | $ | — |  |  | $ | 2.90 |  |  | $ | — |
Stock compensation expense |  |  |  |  |  |  |
Research and development | $ | 977 |  |  | $ | 696 |  |  | $ | 1,852 |  |  | $ | 1,454 |
General and administrative | 1,987 |  |  | 1,369 |  |  | 3,243 |  |  | 2,346 |
Total stock compensation expense | $ | 2,964 |  |  | $ | 2,065 |  |  | $ | 5,095 |  |  | $ | 3,800 |
The RSUs vest in three equal annual installments beginning one year from the grant date.

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