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Income Taxes - Schedule of Research and Development Credit Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Federal |  |
Income Tax Disclosure [Line Items] |  |
R&D credits | $ 632 | $ 467
California |  |
Income Tax Disclosure [Line Items] |  |
R&D credits | $ 117 | $ 91

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