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Stockholders' Equity - Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	$ 2,918	$ 2,579	$ 5,839	$ 5,220
Amounts capitalized as part of inventory	291	276	560	465
Total stock-based compensation expense, gross	3,209	2,855	6,399	5,685
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	30	22	52	36
General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	1,209	1,018	2,294	1,796
Marketing and Selling
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	812	690	1,867	1,861
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	$ 867	$ 849	$ 1,626	$ 1,527

X

- Definition

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

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