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Debt, net of unamortized deferred financing cost - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 19, 2024 | Jul. 31, 2024 | Feb. 22, 2024 | Jan. 03, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 10, 2023 | Jun. 07, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 221,062,000 | $ 160,453,000 |  | $ 2,810,000 |  |
Debt, net of unamortized deferred financing cost |  |  |  |  | 0 | 186,353,000 | $ 186,353,000 |  |  |
Number of securities called by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  | 19,892,387
Preferred stock tranche liability, at fair value |  |  |  |  | 3,940,000 | 0 | 0 |  |  |
Gain (loss) on preferred stock tranche liability |  |  |  |  | 600,000 |  | 0 | $ 0 |  |
Allianz Strategic Investments S.à.r.l. (“Allianz”) | Series A Preferred Stock | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, per-dollar amount (in dollars per share) |  | $ 1,000 |  |  |  |  |  |  |  |
Allianz Strategic Investments S.à.r.l. (“Allianz”) | Allianz Tranche Right | Series A Preferred Stock | Allianz Investment Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of securities called by warrants or rights (in shares) |  |  | 50,000 |  |  |  |  |  |  |
Preferred stock, dividend rate, per-dollar amount (in dollars per share) |  |  | $ 1,000 |  |  |  |  |  |  |
Alvarium, TWMH And TIG |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 124,400,000 |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 133,400,000 |  |  |  |  |  |  |  |  |
Write-off of deferred issuance costs | $ 4,500,000 |  |  |  |  |  |  |  |  |
Debt, net of unamortized deferred financing cost |  |  |  |  | 0 | 186,353,000 | 186,353,000 |  |  |
Credit facility | Line of credit |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 250,000,000.0 |  |  |  |  |  |
Credit facility | Line of credit | Term Loans |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 100,000,000.0 |  |  |  |  |  |
Debt, net of unamortized deferred financing cost |  |  |  |  | 0 | 92,603,000 | 92,603,000 |  |  |
Debt instrument, increase in basis spread on variable rate (in percent) |  |  | 0.50% |  |  |  |  |  |  |
Line of credit facility, commitment fee amount |  |  | $ 40,000,000 |  |  |  |  |  |  |
Credit facility | Line of credit | Term Loans | Minimum | Base rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  | 1.00% |  |  |  |  |  |
Credit facility | Line of credit | Term Loans | Minimum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  | 2.00% |  |  |  |  |  |
Credit facility | Line of credit | Term Loans | Maximum | Base rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  | 2.00% |  |  |  |  |  |
Credit facility | Line of credit | Term Loans | Maximum | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  |  |  | 3.00% |  |  |  |  |  |
Credit facility | Line of credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 150,000,000.0 |  |  |  |  | $ 110,000,000 |
Accordion option, additional borrowing capacity |  |  |  | 75,000,000.0 |  |  |  |  |  |
Accordion feature, maximum borrowing capacity |  |  |  | $ 225,000,000.0 |  |  |  |  |  |
Unfunded commitment |  |  |  |  | 0.0 | $ 16,300,000 | $ 16,300,000 |  |  |
Weighted average interest rate (in percent) |  |  |  |  |  | 9.00% | 9.00% |  |  |
Debt, net of unamortized deferred financing cost |  |  |  |  | $ 0 | $ 93,750,000 | $ 93,750,000 |  |  |
Reduced credit facility amount |  |  |  |  |  |  |  |  | $ 50,000,000 |

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