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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized tax benefits
Balance at beginning of the year	$ 22,803	$ 15,076	$ 13,486
Net additions for tax positions - prior years	505	4,987	230
Net additions for tax positions - current year	3,489	3,355	2,339
Subtractions from tax positions - prior years	(327)	(74)	(537)
Subtractions from tax positions - current year	(654)	(541)	(442)
Balance at end of the year	25,816	22,803	15,076
Amount that would impact the effective tax rate if uncertain tax benefits were recognized	500
Accrued interest and penalties associated with uncertain tax positions	$ 0	$ 0	$ 0

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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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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