Quarterly report pursuant to Section 13 or 15(d)

Sales to Major Customers (Details)

v3.8.0.1
Sales to Major Customers (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
customer
Apr. 01, 2017
customer
Segment Reporting, Asset Reconciling Item    
Number of major customers | customer 2 2
Sales Revenue, Net | Customer Concentration Risk | Major Customer One    
Segment Reporting, Asset Reconciling Item    
Percent of consolidated revenue 20.00% 24.00%
Sales Revenue, Net | Customer Concentration Risk | Major Customer Two    
Segment Reporting, Asset Reconciling Item    
Percent of consolidated revenue 16.00% 18.00%
Sales Revenue, Net | Customer Concentration Risk | Two Major Customers    
Segment Reporting, Asset Reconciling Item    
Accounts receivable from major customers | $ $ 32.2