Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)
Significant Accounting Policies [Line Items]
Contract with customer, liability	$ 7,700	$ 7,100
Revenues	317,539	311,678	$ 301,012
Allowance for doubtful accounts	359	263	1,197
Retained earnings	$ (132,559)	(95,424)
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
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	5 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	$ 2,700	2,700	6,400
Advisory Fees
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts	400	300	1,200
Advisory Services
Significant Accounting Policies [Line Items]
Contract with customer, liability, revenue recognized	$ 4,900	$ 2,300	$ 4,700