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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, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | [1] | Jun. 30, 2018 USD ($) | [1] | Mar. 31, 2018 USD ($) | [1] | Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | [1] | Sep. 30, 2017 USD ($) | [1]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Revenue | $ 64,960 | $ 61,166 | $ 65,764 | $ 62,313 | $ 65,118 | $ 62,272 | $ 54,548 | $ 44,955 | $ 254,203 | $ 226,893 | $ 181,340
Operating income (loss) |  |  |  |  |  |  |  |  | 10,072 | 2,782 | 8,866
Depreciation and amortization |  |  |  |  |  |  |  |  | 13,396 | 12,784 | 5,565
IoT Products & Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 215,287 | 201,506 | 174,237
Operating income (loss) |  |  |  |  |  |  |  |  | 18,674 | 14,923 | 12,804
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,102 | 6,040 | 3,575
IoT Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 38,916 | 25,387 | 7,103
Operating income (loss) |  |  |  |  |  |  |  |  | (8,602) | (12,141) | (3,938)
Depreciation and amortization |  |  |  |  |  |  |  |  | $ 7,294 | $ 6,744 | $ 1,990
[1] | Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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