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Segment Data and Related Information (Schedule of Reportable Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]                      
Revenue $ 33,530 $ 27,266 $ 23,850 $ 25,482 $ 24,300 $ 17,219 $ 21,745 $ 24,001 $ 110,128 $ 87,265 $ 85,617
Gross profit 12,463 9,218 6,427 7,474 (232) 3,704 5,809 5,808 35,582 15,089 18,487
R&D expense 6,236 4,807 4,584 4,642 6,435 4,629 4,360 4,019 20,269 19,443 15,387
Total consolidated segment profit (loss)                 15,313 (4,354) 3,100
Unallocated (income) expense:                      
Selling, general, and administrative 5,669 5,936 7,139 5,887 8,243 9,288 6,956 7,593 24,631 32,080 21,377
(Gain) loss on sale of assets (55) (312) (315) (1,602) (302)       (2,284) (302) 34
Interest (income) expense, netInterest expense (income), net 50 40 (1) 15 (39) (99) (224) (267) 104 (629) (733)
Foreign exchange loss (227) 20 156 (147) 396 349 (304) (14) (198) 427 434
Other income                     (110)
Total unallocated expense                 22,253 31,576 21,002
Loss before income tax expense $ 790 $ (1,273) $ (5,136) $ (1,321) $ (14,965) $ (10,463) $ (4,979) $ (5,523) (6,940) (35,930) (17,902)
Aerospace and Defense revenue                      
Segment Reporting Information [Line Items]                      
Revenue                 55,240 33,086 13,567
Broadband revenue                      
Segment Reporting Information [Line Items]                      
Revenue                 54,888 54,179 72,050
Aerospace And Defense                      
Segment Reporting Information [Line Items]                      
Gross profit                 16,729 9,207 2,406
R&D expense                 17,469 10,448 4,185
Total consolidated segment profit (loss)                 (740) (1,241) (1,779)
Broadband                      
Segment Reporting Information [Line Items]                      
Gross profit                 18,853 5,882 16,081
R&D expense                 2,800 8,995 11,202
Total consolidated segment profit (loss)                 $ 16,053 $ (3,113) $ 4,879