9. Stock-Based Compensation

There have been no material changes to the terms of our various equity incentive plans since the filing of our Annual Report on Form 10-K. Refer to Note 13, “Stock-Based Compensation,” in our Annual Report on Form 10-K filed with the SEC on March 15, 2024 for more information.

Stock-Based Compensation

As of September 30, 2024, there was approximately $1,029 of total unrecognized compensation cost related to our stock benefit plans. These unrecognized compensation costs are expected to be recognized over an estimated weighted-average period of approximately 1.71 years.

Restricted Stock Units

Stock Options

A summary of our stock option activity under the 2018 Equity Incentive Plan (the “2018 Plan) and related information is as follows:

A summary of our option activity under our 2009 Equity Incentive Plan (the “2009 Plan”) and related information is as follows:

Our stock benefit plans had 211,270 and 86,837 shares of common stock reserved for future issuances under our equity incentive plans as of September 30, 2024 and December 31, 2023, respectively. In addition, the shares of common stock reserved for issuance under the 2018 Plan also will include any shares of common stock subject to stock options granted under the 2009 Plan, that expire or otherwise terminate without having been exercised in full and shares of common stock issued pursuant to awards granted under the 2009 Plan that are forfeited. As of September 30, 2024, the maximum number of shares of common stock that may be added to the 2018 Plan pursuant to the foregoing is 1,205.

Furthermore, there were 46,791 and 30,415 shares of common stock available for sale and reserved for issuance under our 2018 Employee Stock Purchase Plan as of September 30, 2024 and December 31, 2023, respectively.