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Nature of Business and Basis of Presentation - Textual (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 24, 2016
Sep. 26, 2015
Sep. 24, 2016
Sep. 26, 2015
Accounting Policies [Line Items]        
Fiscal year/fiscal quarter duration     91 days 91 days
Products $ 49,631 $ 36,414 $ 136,290 $ 113,689
Cost of products $ 22,810 19,242 $ 62,625 59,106
Maximum period of delivery to customers     6 months  
Maximum period services are provided over the fixed arrangement term     12 months  
Reclassification [Member]        
Accounting Policies [Line Items]        
Products   800   7,600
Cost of products   $ 100   $ 2,900
Minimum [Member]        
Accounting Policies [Line Items]        
Fiscal year/fiscal quarter duration     364 days  
Maximum [Member]        
Accounting Policies [Line Items]        
Fiscal year/fiscal quarter duration     371 days