Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018	Dec. 29, 2018
Income Taxes [Line Items]
Provision for income taxes	$ 9,000	$ 4,000	$ 15,000	$ 8,000
Unrecognized tax benefits					$ 1,200,000
Unrecognized tax benefits recognition impact on income tax rate					$ 0
Federal
Income Taxes [Line Items]
Income tax returns examination period			3 years
Minimum | State Jurisdictions
Income Taxes [Line Items]
Income tax returns examination period			3 years
Maximum | State Jurisdictions
Income Taxes [Line Items]
Income tax returns examination period			5 years