Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Deferred compensation	$ 2,959	$ 4,498
Loss and credit carryforwards	701	1,454
Accruals deductible for tax purposes when paid	231	908
State taxes	715	639
Depreciation	34	42
Unrealized gain	143	74
Leases	4,726	5,691
Research and development expenses	1,086
Other	41	13
Gross deferred tax assets	10,636	13,319
Deferred tax asset valuation allowance	(746)	(2,128)	$ (7,664)	$ (5,695)
Gross deferred tax assets less valuation allowance	9,890	11,191
Liabilities
Amortization	(3,221)	(1,847)
Depreciation	(521)	(477)
Leases	(4,726)	(5,691)
Deferred compensation	(18)	(22)
Gross deferred tax liabilities	(8,486)	(8,037)
Net deferred tax assets (liabilities)	1,404	3,154
Net non-current assets	2,886	4,946	$ 393
Net non-current liabilities	(1,482)	(1,792)
Net deferred tax assets (liabilities)	$ 1,404	$ 3,154