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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		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	$ 2,558	$ 2,027	$ 7,778	$ 4,926
Amounts capitalized as part of inventory	258	182	723	449
Total stock-based compensation expense, gross	2,816	2,209	8,501	5,375
Cost of Sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	7	4	43	11
General and Administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	1,082	701	2,878	1,875
Marketing and Selling
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	692	471	2,553	1,297
Research and Development Expense
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense, net	$ 777	$ 851	$ 2,304	$ 1,743

X

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

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