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Income Taxes - Schedule of Research and Development Credit Carryforwards (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Federal
Income Tax Disclosure [Line Items]
R&D credits	$ 0	$ 632
California
Income Tax Disclosure [Line Items]
R&D credits	$ 117	$ 117

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Income tax disclosure.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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