Income Taxes - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jun. 29, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes Disclosure [Line Items]
Income tax (benefit) expense		$ 462,000	$ (384,000)	$ 307,000	$ (523,000)
California | Tax Years 2020 through 2022
Income Taxes Disclosure [Line Items]
Annual cap on amount of business incentive tax credits	$ 5,000,000