Income Taxes - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jun. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Taxes Disclosure [Line Items]
Income tax benefit		$ (548,000)	$ (96,000)	$ (241,000)	$ (619,000)
California | Tax Years 2020 through 2022
Income Taxes Disclosure [Line Items]
Annual cap on amount of business incentive tax credits	$ 5,000,000.0