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Income Taxes - Narrative (Details)	12 Months Ended
	Dec. 31, 2020 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	48,400,000
California Franchise Tax Board
Operating loss carryforwards (NOLs)
NOLs	70,700,000
Capital Loss Carryforward
Operating loss carryforwards (NOLs)
Tax credits	700,000
R&D credits | Federal
Operating loss carryforwards (NOLs)
Tax credits	2,500,000
R&D credits | California Franchise Tax Board
Operating loss carryforwards (NOLs)
Tax credits	$ 1,800,000

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

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