Commitments and Contingencies - Textual (Details)	3 Months Ended	9 Months Ended
	Sep. 26, 2020 USD ($)	Sep. 26, 2020 USD ($)
Commitments And Contingencies [Line Items]
Sold receivables amount	$ 7,738,000
Due from unrelated third parties	0	$ 0
Liabilities recorded for obligations	0	$ 0
Percentage of maximum borrowing capacity of value of eligible securities		70.00%
Available line of credit	$ 71,200,000	$ 71,200,000
Available interest rate on line of credit	1.80%	1.80%
Minimum [Member]
Commitments And Contingencies [Line Items]
Warranty period		12 months
Maximum [Member]
Commitments And Contingencies [Line Items]
Warranty period		14 months