Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Contract with customer, liability	$ 11,700		$ 7,700
Revenues	$ 45,441	$ 68,924
Depreciation and amortization of property and equipment	Depreciation is computed using the straight-line method over the life of the assets. Amortization of leasehold improvements is computed using the straight-line method over the lesser of the life of the asset or the remaining term of the lease.
Equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets	5 years
Furniture and Fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets	7 years
Leasehold Improvements
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets	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]
Restricted stock units, amortization service period	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]
Restricted stock units, amortization service period	5 years
Primary Capital Advisory Engagements
Significant Accounting Policies [Line Items]
Long term receivables related to private equity and real estate capital advisory engagements	$ 1,400		$ 1,500
Installments period	3 years
Reimbursement Revenue
Significant Accounting Policies [Line Items]
Revenues	$ 400	600
Advisory Fees
Significant Accounting Policies [Line Items]
Bad debt (reversal) expense	(200)	100
Capital advisory engagements
Significant Accounting Policies [Line Items]
Contract with customer, liability, revenue recognized	$ 400	$ 3,200