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Income Taxes - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)
Operating loss carryforwards (NOLs)
Interest and/or penalties incurred	$ 0
Federal
Operating loss carryforwards (NOLs)
NOLs, subject to expiration	128,900,000
NOLs, not subject to expiration	73,300,000
California Franchise Tax Board
Operating loss carryforwards (NOLs)
NOLs	75,600,000
R&D credits | Federal
Operating loss carryforwards (NOLs)
Tax credits	2,400,000
R&D credits | California Franchise Tax Board
Operating loss carryforwards (NOLs)
Tax credits	$ 2,000,000

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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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