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Segment and Geographic Information (Schedule of Revenues by Geographic Region) (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 30, 2016
USD ($)
Jan. 01, 2016
USD ($)
Dec. 30, 2016
USD ($)
segments
Jan. 01, 2016
USD ($)
Jul. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]          
Number of reportable segments | segments     1    
Revenue $ 68,536 $ 70,416 $ 126,743 $ 149,971  
North America          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 39,353 31,844 67,937 67,064  
Africa and Middle East          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 16,770 23,703 31,119 50,991  
Europe and Russia          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue 2,810 5,617 7,317 12,059  
Latin America and Asia Pacific          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenue $ 9,603 $ 9,252 $ 20,370 $ 19,857  
Accounts Receivable | Customer Concentration Risk | MTN          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk percentage     13.00%   22.00%
Accounts Receivable | Customer Concentration Risk | Motorola          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk percentage     12.00%   11.00%
Revenue | Customer Concentration Risk | MTN          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk percentage 12.00% 20.00% 11.00% 18.00%  
Revenue | Customer Concentration Risk | Motorola          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Concentration risk percentage   10.00%