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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. 24, 2016 | Sep. 26, 2015 | Sep. 24, 2016 | Sep. 26, 2015
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 | $ 2,000 | $ 1,682 | $ 5,432 | $ 4,664
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 | 116 | 96 | 273 | 229
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 | 138 | 104 | 355 | 195
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 | 387 | 300 | 985 | 796
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 | 537 | 511 | 1,492 | 1,403
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 | $ 822 | $ 671 | $ 2,327 | $ 2,041

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