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Stockholders' Equity - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 25, 2024 | Jul. 06, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Jun. 30, 2024 | Mar. 01, 2024 | Jun. 30, 2023 | May 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  | 50,000,000 |  | 50,000,000 |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  | $ 0.001
Preferred stock, issued (in shares) |  |  | 0 |  | 0 |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  |  | $ 9,603,000 | $ 31,241,000 |  |  |  |  |  |
Class A Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized (in shares) |  |  | 50,000,000 |  | 50,000,000 |  | 50,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |  |
Common stock, issued (in shares) |  |  | 10,231,736 |  | 10,231,736 |  | 10,186,783 |  |  |  |  |
Common stock, outstanding (in shares) |  | 10,447,392 | 10,231,736 | 10,289,233 | 10,231,736 | 10,289,233 | 10,186,783 | 10,227,845 | 10,357,376 | 10,884,575 |  | 10,868,556
Total consideration for repurchase of stock |  |  | $ 294,862 | $ 6,500,000 | $ 9,600,000 | $ 13,800,000 |  |  |  |  |  |
Remaining amount authorized for repurchase (in shares) |  |  | 497,893 |  | 497,893 |  | 223,699 |  | 638,155 |  |  |
Class A Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend payable amount per share (in dollars per share) | $ 0.18 |  |  |  |  |  |  |  |  |  |  |
Class A Stock | Modified Dutch Auction Tender Offer |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |
Stock repurchase program, price (in dollars per share) |  | $ 40.00 |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  | 437,183 |  |  |  |  |  |  |  |  |  |
Payments for repurchase of common stock |  | $ 17,490,000 |  |  |  |  |  |  |  |  |  |
Class A Stock | Modified Dutch Auction Tender Offer | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 34.00 |
Class A Stock | Modified Dutch Auction Tender Offer | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, price (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 40.00 |
Class A Stock | New Program |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  | 5,981 | 168,904 | 243,806 | 360,094 | 463,335 |  |  |  |  |
Total consideration for repurchase of stock |  |  |  |  |  |  | $ 17,600,000 |  |  |  |  |
Stock repurchased (in dollars per share) |  |  | $ 49.30 | $ 38.30 | $ 39.39 | $ 38.20 | $ 38.07 |  |  |  |  |
Class A Stock | Previous Program |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining amount authorized for repurchase (in shares) |  |  |  |  |  |  |  |  | 120,155 |  |  |
Class A Stock | Share Repurchase Program, March (2024) |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  | 518,000 |  |  |
Shares repurchased as a percent of shares outstanding (as a percent) |  |  |  |  |  |  |  |  | 5.00% |  |  |
Class B Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized (in shares) |  |  | 99,665 |  | 99,665 |  | 99,665 |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |  |
Common stock, issued (in shares) |  |  | 99,665 |  | 99,665 |  | 99,665 |  |  |  |  |
Common stock, outstanding (in shares) |  |  | 99,665 |  | 99,665 |  | 99,665 |  |  |  |  |
Class B Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly dividend payable amount per share (in dollars per share) | $ 0.18 |  |  |  |  |  |  |  |  |  |  |

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