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Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Capitalized computer software, additions	$ 300
Capitalized software developed for internal use	13,542		$ 17,384
Depreciation and amortization expense	816	$ 677
Capitalized software costs, accumulated amortization	1,000	900
Maximum [Member]
Property Plant And Equipment [Line Items]
Capitalized computer software, additions		100
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Capitalized software developed for internal use	2,400	1,900
Depreciation and amortization expense	$ 100	$ 200
Capitalized Software [Member] \| Maximum [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	5 years
Capitalized Software [Member] \| Minimum [Member]
Property Plant And Equipment [Line Items]
Property, equipment and capitalized software, useful life	3 years
Building
Property Plant And Equipment [Line Items]
Book value of building	$ 1,800
Proceeds from sale of building	2,500
Gain on sale of building	$ 600