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Retirement plans
 9 Months Ended
Sep. 30, 2024
Retirement plans  
Retirement plans

16. Retirement plans

We offer a defined contribution 401(k) retirement plan to substantially all of our U.S. employees. Participants may contribute from 1% to 90% of eligible compensation, inclusive of pretax and/or Roth deferrals (subject to Internal Revenue Service limitations), and we make matching contributions under this plan on the first 5% of the participant’s compensation (100% match of the first 3% employee contribution and 50% match on the next 2% contribution). Our matching contributions fully vest upon participation. For the nine months ended September 30, 2024 and 2023, we recognized expense of $0.9 million and $0.9 million, respectively.  For the three months ended September 30, 2024 and 2023, we recognized expense of $0.2 million and $0.3 million, respectively.