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Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule of operations by geographic segment          
Subtotal $ 3,555 $ 2,237 $ 5,521 $ 4,688  
Net sales 44,855 40,922 86,160 77,907  
Segment net income (loss) 37 55 (1,385) (1,068)  
Depreciation and amortization 3,103 1,717 6,232 3,410  
Total assets 231,449 186,787 231,449 186,787 $ 235,837
Subtotal [Member]          
Schedule of operations by geographic segment          
Subtotal 48,410 43,159 91,681 82,595  
Eliminations [Member]          
Schedule of operations by geographic segment          
Subtotal (3,555) (2,237) (5,521) (4,688)  
Mobile communication [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 22,699 21,645 45,180 42,641  
Mobile communication [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 719 95 990 281  
Mobile communication [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 6,365 5,694 11,502 11,543  
Mobile communication [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal 8,256 2,230 16,610 4,174  
Guidance and stabilization [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 1,986 2,725 3,071 4,698  
Guidance and stabilization [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 1,582 2,339 3,792 5,521  
Guidance and stabilization [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 1,545 869 2,392 1,970  
Guidance and stabilization [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal 1,703 5,325 2,623 7,079  
Americas [Member]          
Schedule of operations by geographic segment          
Subtotal 2,508 1,376 3,676 2,952  
Net sales 31,093 33,613 59,888 63,361  
Segment net income (loss) 77 635 (1,077) (561)  
Depreciation and amortization 1,165 1,129 2,341 2,260  
Total assets 143,007 126,758 143,007 126,758  
Americas [Member] | Subtotal [Member]          
Schedule of operations by geographic segment          
Subtotal 33,601 34,989 63,564 66,313  
Americas [Member] | Eliminations [Member]          
Schedule of operations by geographic segment          
Subtotal (2,508) (1,376) (3,676) (2,952)  
Americas [Member] | Mobile communication [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 22,275 21,229 44,321 41,906  
Americas [Member] | Mobile communication [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 701 78 956 248  
Americas [Member] | Mobile communication [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 221 186 319 213  
Americas [Member] | Mobile communication [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal 1,080 862 2,414 1,726  
Americas [Member] | Guidance and stabilization [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 1,986 2,725 3,071 4,698  
Americas [Member] | Guidance and stabilization [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 1,582 2,339 3,792 5,521  
Americas [Member] | Guidance and stabilization [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 1,545 869 2,392 1,970  
Americas [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal 1,703 5,325 2,623 7,079  
Europe and Asia [Member]          
Schedule of operations by geographic segment          
Subtotal 1,047 861 1,845 1,736  
Net sales 13,762 7,309 26,272 14,546  
Segment net income (loss) (40) (580) (308) (507)  
Depreciation and amortization 1,938 588 3,891 1,150  
Total assets 88,442 60,029 88,442 60,029  
Europe and Asia [Member] | Subtotal [Member]          
Schedule of operations by geographic segment          
Subtotal 14,809 8,170 28,117 16,282  
Europe and Asia [Member] | Eliminations [Member]          
Schedule of operations by geographic segment          
Subtotal (1,047) (861) (1,845) (1,736)  
Europe and Asia [Member] | Mobile communication [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 424 416 859 735  
Europe and Asia [Member] | Mobile communication [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 18 17 34 33  
Europe and Asia [Member] | Mobile communication [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 6,144 5,508 11,183 11,330  
Europe and Asia [Member] | Mobile communication [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal 7,176 1,368 14,196 2,448  
Europe and Asia [Member] | Guidance and stabilization [Member] | United States [Member]          
Schedule of operations by geographic segment          
Subtotal 0 0 0 0  
Europe and Asia [Member] | Guidance and stabilization [Member] | Canada [Member]          
Schedule of operations by geographic segment          
Subtotal 0 0 0 0  
Europe and Asia [Member] | Guidance and stabilization [Member] | Europe [Member]          
Schedule of operations by geographic segment          
Subtotal 0 0 0 0  
Europe and Asia [Member] | Guidance and stabilization [Member] | Other geographic areas [Member]          
Schedule of operations by geographic segment          
Subtotal $ 0 $ 0 $ 0 $ 0