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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	May 16, 2019	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense		$ 1,914	$ 2,146	$ 3,467	$ 3,610
Unrecognized compensation expense related to stock awards		$ 8,187		$ 8,187
Recognition period				1 year 9 months 18 days
Share-based Payment Arrangement, Nonemployee | Director | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of units granted	7,432
Aggregate grant date fair value	$ 656

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Fair value of share-based compensation granted to nonemployees as payment for services rendered or acknowledged claims.

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