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Restructuring Charges - Additional Information (Details) |  |  | 3 Months Ended | 9 Months Ended
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Sep. 29, 2015 Employee | Aug. 21, 2015 Position Employee | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | $ 2,561,000 | $ 2,561,000 | $ 84,000
Total expenses on restructuring activities |  |  | 2,900,000 |  |
Expected future payments for restructuring |  |  | 2,700,000 | 2,700,000 |
Severance, Other Termination Benefits and Outplacement Services [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | 2,200,000 | 2,174,000 |
Expected additional restructuring charges in the fourth quarter |  |  | $ 300,000 | 300,000 |
Contract Termination Costs [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  |  |  | $ 387,000 |
Facility Costs [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  |  |  |  | $ 84,000
2015 Restructuring [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Number of positions eliminated | Position |  | 58 |  |  |
Number of open positions eliminated | Position |  | 20 |  |  |
Number of employees eliminated | Employee | 5 | 38 |  |  |

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