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Insider Trading Arrangements	3 Months Ended	9 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Trading Arrangements [Member] \| Katharine A. Keenan [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On August 8, 2024, Katharine A. Keenan, our Chief Executive Officer, terminated three separate “Rule 10b5-1 trading arrangements,” as defined in Item 408(c) of Regulation S-K, each of which was intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and provided for the automatic sale of shares of class A common stock in order to satisfy tax withholding obligations arising from vesting of three separate grants to Ms. Keenan of 52,000 shares of restricted stock each. The terminated arrangements were adopted on February 17, 2022, February 22, 2023 and March 15, 2024, and such arrangements were to automatically terminate on the earlier of December 31, 2024, December 31, 2025 and December 31, 2026, respectively, or, with respect to each such arrangement, the completion of all of the contemplated transactions set forth therein.
Name	Katharine A. Keenan
Title	Chief Executive Officer
Rule 10b5-1 Arrangement Terminated	true
Termination Date	August 8, 2024
Aggregate Available	52,000	52,000
New Rule 10b5-1 Trading Arrangement [Member] \| Katharine A. Keenan [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		Subsequently on August 8, 2024, Ms. Keenan adopted a new Rule 10b5-1 trading arrangement, which is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act, that provides for the automatic sale of shares of class A common stock in order to satisfy tax withholding obligations arising from vesting of an aggregate of 51,999 shares of restricted stock previously granted to Ms. Keenan on various dates. The number of shares to be sold under the new arrangement is unknown, as the number of shares will vary based on the extent to which vesting conditions are satisfied and the market price of our class A common stock at the time of vesting. The new arrangement will expire on December 31, 2026, subject to the arrangement’s earlier expiration or completion in accordance with its terms. The new arrangement relates to sales to cover tax withholding obligations arising from vesting events scheduled to occur after February 5, 2025, six months following the date Ms. Keenan purchased shares of our class A common stock on the open market. All of these sales would have been covered by the terminated arrangements if they had not been terminated.
Name	Katharine A. Keenan
Title	Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 8, 2024
Expiration Date	December 31, 2026
Arrangement Duration	875 days
Aggregate Available	51,999	51,999