Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Significant Accounting Policies [Line Items]
Contract with customer, liability	$ 10,700		$ 10,700		$ 9,000
Revenues	$ 30,689	$ 81,145	$ 151,802	$ 162,635
Depreciation and amortization of property and equipment [Extensible Enumeration]	Depreciation Method, Straight-Line [Member]		Depreciation Method, Straight-Line [Member]
Equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	5 years		5 years
Furniture and Fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	7 years		7 years
Leasehold Improvements
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	15 years		15 years
Minimum
Significant Accounting Policies [Line Items]
Amortization period of deferred cash retention awards			3 years
Minimum | Restricted Stock
Significant Accounting Policies [Line Items]
Amortization period of restricted stock units			3 years
Maximum
Significant Accounting Policies [Line Items]
Amortization period of deferred cash retention awards			5 years
Maximum | Restricted Stock
Significant Accounting Policies [Line Items]
Amortization period of restricted stock units			4 years
Primary Capital Advisory Engagements
Significant Accounting Policies [Line Items]
Long term receivables related to primary capital advisory engagements	$ 3,300		$ 3,300		$ 4,100
Installments period			3 years
Reimbursement Revenue
Significant Accounting Policies [Line Items]
Revenues	900	700	$ 2,700	1,900
Advisory Fees
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts (reversal of allowance)	$ 200	$ 100	200	(300)
Capital advisory engagements
Significant Accounting Policies [Line Items]
Contract with customer, liability, revenue recognized			$ 5,900	$ 3,800