Income Taxes - Summary of Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Intangible assets	$ 3,237	$ 5,279
Net operating losses	13,490	13,704
Compensation accruals	12,971	12,789
Lease liability	5,835	6,897
Investments	3,758	5,561
Capital losses	1,255	773
Other	984	581
Gross deferred tax assets	41,530	45,584
Valuation allowance	(6,107)	(6,844)
Gross deferred tax assets after valuation allowance	35,423	38,740
Deferred tax liabilities:
Intangible assets	(18,170)	(15,252)
Right of use asset	(4,328)	(5,263)
Fixed assets	(1,900)	(1,372)
Other investments	(1,487)	(975)
Gross deferred tax liabilities	(25,885)	(22,862)
Deferred tax assets, net	$ 9,538	$ 15,878