offering price of up to $100,000 from time to time through Jefferies, acting as agent. The Company did not offer or sell shares of its common stock under the 2021 Sales Agreement during the three and six months ended June 30, 2024. During the three and six months ended June 30, 2023, the Company sold 1,370,208 shares of common stock under the 2021 Sales Agreement, resulting in gross proceeds to the Company of $9,162, and net proceeds, after accounting for issuance costs, of $8,824.
11. Stock-Based Awards
For the three and six months ended June 30, 2024, the Company had three stock-based compensation plans under which it was able to grant stock-based awards, the 2021 Stock Incentive Plan, as amended (the “2021 Plan”), the 2019 Inducement Stock Incentive Plan, as amended (the “2019 Inducement Plan”), and the 2014 Employee Stock Purchase Plan (the “ESPP”) (collectively, the “Stock Plans”). The 2021 Plan and the 2019 Inducement Plan provide for the grant of incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units (“RSUs”), stock appreciation rights and other stock-based awards.
The terms and conditions of the Stock Plans are described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on March 11, 2024. Subsequent updates to Stock Plans during the three and six months ended June 30, 2024 are as follows:
2021 Plan - On June 12, 2024, the Company’s shareholders approved an amendment of the 2021 Plan to increase the aggregate number of shares issuable thereunder by 7,000,000.
2019 Inducement Plan - On February 20, 2024, the Company’s board of directors amended the 2019 Inducement Plan to increase the aggregate number of shares issuable thereunder from 1,054,000 to 3,804,000 shares of common stock. On April 16, 2024, the board of directors of the Company further amended the 2019 Inducement Plan to increase the aggregate number of shares issuable thereunder from 3,804,000 to 4,804,000 shares of common stock.
ESPP - On January 1, 2024, the number of shares available for issuance under the ESPP increased from 398,784 to 606,186.
As of June 30, 2024, 8,803,632, 544,696, and 485,380 shares of common stock remained available for issuance under the 2021 Plan, the 2019 Inducement Plan, and the ESPP, respectively.
Stock options and RSUs
During the three and six months ended June 30, 2024, the Company granted options to purchase 1,010,325 and 6,828,071 shares of common stock, respectively, at a weighted exercise price of $6.11 and $7.12 per share, respectively. Of these, options to purchase 37,900 and 4,328,627 shares of common stock, respectively, were granted under the 2021 Plan, and options to purchase 972,425 and 2,499,444 shares of common stock, respectively, were granted under the 2019 Inducement Plan.
During the three and six months ended June 30, 2024, the Company granted 333,341 and 2,611,757 RSUs, respectively. Of these, 12,634 and 1,355,771 RSUs, respectively, were granted under the 2021 Plan, and 320,707 and 1,255,986 RSUs, respectively, were granted under the 2019 Inducement Plan. Each RSU is settleable for one share of common stock upon vesting.
During the three and six months ended June 30, 2024, 731,580 and 1,040,261 stock options, respectively, and 147,238 and 266,842 RSUs, respectively, expired or were forfeited.