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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act.

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Amount of unrecognized tax benefits.

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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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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Effect of the Tax Act, income tax expense	$ 5,600
Effect of the Tax Act, income tax benefit				$ 1,400
Effect of the CARES Act		$ 2,636	$ 0	0
Minimum cumulative change in ownership that could result in a Section 382 ownership change (as a percent)		50.00%
Tax credit carryforward		$ 3,300
Amount of unrecognized tax benefits		255	2,906	$ 2,906
Tax benefits that would impact the effective tax rate		184	0
Interest and penalties accrued related to unrecognized tax benefits		22,000	$ 424,000
Federal income tax purpose
Income Taxes
Net operating loss carryforward		29,000
California franchise tax purpose
Income Taxes
Net operating loss carryforward		$ 7,000