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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
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Apr. 03, 2020 | Mar. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense, net | $ 2,921 | $ 2,641
Amounts capitalized as part of inventory | 269 | 189
Total stock-based compensation expense, gross | 3,190 | 2,830
Cost of Sales |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense, net | 22 | 14
General and Administrative |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense, net | 1,085 | 778
Marketing and Selling |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense, net | 1,055 | 1,171
Research and Development Expense |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |
Total stock-based compensation expense, net | $ 759 | $ 678

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