Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Effect of the CARES Act	$ 0	$ 2,636,000	$ 0
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent)	50.00%
Tax credit carryforward	$ 1,800,000
Amount of unrecognized tax benefits	1,437,000	255,000	$ 2,906,000
Tax benefits that would impact the effective tax rate	563,000	184,000
Interest and penalties accrued related to unrecognized tax benefits	31,000	22,000
Penalties accrued related to unrecognized tax benefits	0	$ 0
Federal income tax purpose
Income Taxes
Net operating loss carryforward	24,700,000
California franchise tax purpose
Income Taxes
Net operating loss carryforward	$ 6,600,000

Effective Income Tax Rate Reconciliation, CARES Act, Amount

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The minimum cumulative change in percentage points of the outstanding stock of the entity by certain stockholders or public groups which results from a transaction or a series of transactions over a specified period that could result in an ownership change as defined by Section 382 of the Internal Revenue Code.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of unrecognized tax benefits.

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Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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