Equity-Based Compensation and Earn-in Expenses - Narrative (Details) $ / shares in Units, $ in Thousands								3 Months Ended		6 Months Ended		12 Months Ended	13 Months Ended
	Jun. 26, 2024 $ / shares shares	Jun. 05, 2024 $ / shares shares	Mar. 01, 2024 $ / shares shares	Feb. 06, 2024 $ / shares shares	Jul. 14, 2023 USD ($) d	May 31, 2023 $ / shares shares	Mar. 23, 2023 $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2022 $ / shares shares	Jan. 07, 2022 d
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unrecognized equity-based compensation expense								$ 30,400		$ 30,400			$ 30,400
Unrecognized equity-based compensation expense, weighted average recognition period (in years)										2 years 3 months 25 days
Share-based payment arrangement, expense								4,989	$ 2,576	$ 11,343	$ 33,134
Earn-in consideration payable								969		$ 969		$ 1,830	969
Holbein Partners, LLP (“Holbein”)
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Earn-in expense, cash (in percent)										50.00%
Earn-in expense, equity (in percent)										50.00%
Earn-in share-purchase payment period | d															10
Earn-in payment, first date					$ 7,100
Earn-in payment, second date					$ 8,900
Earn-in, share-purchase price, volume weighted average price, number of days | d					20
Earn-in consideration payable								1,000		$ 1,000		$ 1,800	$ 1,000
RSUs
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								$ 2,136	$ 1,515	$ 5,093	$ 31,060
Number of shares vested in period (in shares) | shares										1,823,811	2,534,202
Shares outstanding (in shares) | shares								6,694,972	4,781,009	6,694,972	4,781,009	4,797,464	6,694,972	0
Shares issued in period (in shares) | shares		2,219,661				4,697,317				4,078,237	7,395,306
Fair value of shares issued (in dollars per share) | $ / shares		$ 4.78				$ 4.35		$ 4.90	$ 4.53	$ 4.90	$ 4.53	$ 4.64	$ 4.90	$ 0
Vesting period (in years)		3 years				3 years
Shares forfeited in period (in shares) | shares										356,918	80,095
RSUs | Share-Based Payment Arrangement, Employee
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								$ 1,400	$ 1,500	$ 3,400	$ 1,500
Shares forfeited in period (in shares) | shares													539,545
RSUs | Board of directors
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								$ 600		$ 800
Shares issued in period (in shares) | shares	123,732		138,564				65,554
Fair value of shares issued (in dollars per share) | $ / shares	$ 4.98		$ 5.87				$ 12.56
Vesting period (in years)	12 months		4 months				9 months
RSUs | Class A Common Stock
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Authorized (in shares) | shares								11,788,132		11,788,132			11,788,132
Available for grant (in shares) | shares								735,147		735,147			735,147
TWMH' Restricted Stock Units (RSUs)
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense									$ 4,200
Shares outstanding (in shares) | shares								0		0			0
Alvarium employee awards
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense											24,600
Share-based payment arrangement, accelerated cost											$ 21,000
Share-based compensation arrangement, accelerated vesting (in shares) | shares											2,100,000
Alvarium employee awards, benefiting acquirer
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense											$ 3,600
Number of shares vested in period (in shares) | shares											360,485
Nasdaq awards | Class A Common Stock
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares issued in period (in shares) | shares											60,800
Fair value of shares issued (in dollars per share) | $ / shares									$ 10.00		$ 10.00
Buy-out equity awards as restricted stock units (RSUs)
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								$ 100		$ 900
Shares issued in period (in shares) | shares				29,154
Fair value of shares issued (in dollars per share) | $ / shares				$ 5.36
Vesting period (in years)				2 years
Buy-out equity awards as restricted stock units (RSUs) | Minimum
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)												1 year
Buy-out equity awards as restricted stock units (RSUs) | Maximum
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vesting period (in years)												3 years
Buy-out equity awards as restricted stock units (RSUs) | Class A Common Stock
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense											$ 600
Buy-out equity awards as restricted stock units (RSUs), first grant date
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares issued in period (in shares) | shares												111,148
Fair value of shares issued (in dollars per share) | $ / shares												$ 7.66
Buy-out equity awards as restricted stock units (RSUs), second grant date
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares issued in period (in shares) | shares												118,987
Fair value of shares issued (in dollars per share) | $ / shares												$ 8.72
PRSUs
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								466	$ 0	$ 466	0
Shares issued in period (in shares) | shares		1,567,125
Fair value of shares issued (in dollars per share) | $ / shares		$ 5.76
Vesting period (in years)										3 years
Earn-in expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								1,079	1,061	$ 3,045	2,074
Earn-in expense | Holbein Partners, LLP (“Holbein”)
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								500	1,100	2,500	2,100
Earn-in expense | East End Advisors, LLC ("EEA")
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								300		300
Earn-in expense | Pointwise Partners Limited ("PW")
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								200		200
Revenue share
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								152	0	364	0
Deferred compensation
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based payment arrangement, expense								$ 1,156	$ 0	$ 2,375	$ 0