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Stockholders' Equity and Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | $ 3,212 | $ 2,447 | $ 8,229 | $ 6,775
Cost of products [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 224 | 216 | 455 | 628
Cost of service [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 223 | 161 | 564 | 463
Research and development [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 744 | 509 | 1,727 | 1,262
Selling [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | 779 | 639 | 2,049 | 1,707
General and administrative [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock-based compensation expense related to employee stock options and employee stock purchases | $ 1,242 | $ 922 | $ 3,434 | $ 2,715

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