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Segment Information and Major Customers Summary of Operating Results by Segment (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Revenue | $ 65,662 | $ 62,716 | $ 54,791 | $ 45,197 | $ 45,105 | $ 45,739 | $ 45,615 | $ 45,175 | $ 228,366 | $ 181,634 | $ 203,005
Operating income (loss) |  |  |  |  |  |  |  |  | 2,322 | 8,807 | 17,105
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,270 | 5,497 | 4,584
IoT Products & Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 201,506 | 174,237 | 202,294
Operating income (loss) |  |  |  |  |  |  |  |  | 14,923 | 12,804 | 18,822
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,040 | 3,575 | 4,040
IoT Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 26,860 | 7,397 | 711
Operating income (loss) |  |  |  |  |  |  |  |  | (12,601) | (3,997) | (1,717)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 6,230 | $ 1,922 | $ 544

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