Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Significant Accounting Policies [Line Items]
Contract with customer, liability	$ 9,000	$ 7,700
Revenues	258,454	317,539	$ 311,678
Allowance for doubtful accounts	(401)	359	263
Retained earnings	$ (125,994)	(132,559)
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.
Number of business segments | Segment	1
Primary Capital Advisory Engagements
Significant Accounting Policies [Line Items]
Long term receivables related to primary capital advisory engagements	$ 4,100	1,500
Installments period	3 years
Equipment
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	5 years
Furniture and fixtures
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	7 years
Leasehold improvements
Significant Accounting Policies [Line Items]
Estimated useful lives of fixed assets (or lesser for Leaseholds)	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	4 years
Maximum | Restricted Stock
Significant Accounting Policies [Line Items]
Amortization period of restricted stock units	5 years
Cumulative effect of the change in accounting principle
Significant Accounting Policies [Line Items]
Retained earnings				$ 100
Reimbursement Revenue
Significant Accounting Policies [Line Items]
Revenues	$ 2,600	2,700	2,700
Advisory Fees
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	400	400	300
Advisory Services
Significant Accounting Policies [Line Items]
Contract with customer, liability, revenue recognized	$ 5,500	$ 4,900	$ 2,300