For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

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Additions made to capitalized computer software costs during the period.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies - Property, Equipment and Capitalized Software Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Capitalized software developed for internal use	$ 18,721		$ 18,721		$ 18,292
Depreciation and amortization expense			1,365	$ 1,237
Capitalized software costs, accumulated amortization	1,000	$ 800	1,000	800
Maximum [Member]
Property Plant And Equipment [Line Items]
Capitalized computer software, additions	100	100	100	100
Capitalized Software [Member]
Property Plant And Equipment [Line Items]
Capitalized software developed for internal use	2,000	2,000	2,000	2,000
Depreciation and amortization expense	$ 100	$ 300	$ 100	$ 300
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			2 years