Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes
Tax credit carryforward	$ 156,000
Amount of unrecognized tax benefits	1,437,000	$ 1,437,000	$ 1,437,000
Tax benefits that would impact the effective tax rate	563,000	563,000
Decrease in unrecognized tax benefits is reasonably possible	1,100,000
Interest and penalties accrued related to unrecognized tax benefits	200,000	89,000
Penalties accrued related to unrecognized tax benefits	0	$ 0
Federal income tax purpose
Income Taxes
Net operating loss carryforward	35,900,000
Operating income (loss)	20,900,000
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	15,000,000
California franchise tax purpose
Income Taxes
Net operating loss carryforward	4,800,000
Operating income (loss)	$ 4,800,000