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Summary of Significant Accounting Policies (ASC 606 Income Statement) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | [1] | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 64,960 |  | $ 61,166 |  | $ 65,764 |  | $ 62,313 |  | $ 65,118 |  | $ 62,272 |  | $ 54,548 |  | $ 44,955 |  | $ 254,203 | $ 226,893 | [1] | $ 181,340 | [1]
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135,168 | 117,839 | [1] | 94,107 | [1]
Gross profit |  | 30,595 |  | 28,328 |  | 30,329 |  | 29,783 |  | 30,613 |  | 29,648 |  | 26,834 |  | 21,959 |  | 119,035 | 109,054 | [1] | 87,233 | [1]
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,963 | 106,272 | [1] | 78,367 | [1]
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,072 | 2,782 | [1] | 8,866 | [1]
Net income |  | $ 2,286 | [2] | $ 1,648 | [2] | $ 1,342 | [2] | $ 4,682 | [2] | $ 3,340 | [2] | $ 2,904 | [2] | $ (126) | [2] | $ (4,487) | [2] | $ 9,958 | $ 1,631 | [1] | $ 9,403 | [1]
Diluted |  | $ 0.08 |  | $ 0.06 |  | $ 0.05 |  | $ 0.17 |  | $ 0.12 |  | $ 0.10 |  | $ 0.00 |  | $ (0.17) |  | $ 0.35 | $ 0.06 | [1] | $ 0.35 | [1]
As reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 228,366 |  | $ 181,634 |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,483 |  | 94,460 |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,883 |  | 87,174 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,561 |  | 78,367 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,322 |  | 8,807 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,303 |  | $ 9,366 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  | $ 0.35 |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 226,893 |  | $ 181,340 |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 117,839 |  | 94,107 |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,054 |  | 87,233 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,272 |  | 78,367 |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,782 |  | 8,866 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,631 |  | $ 9,403 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 |  | $ 0.35 |
ASU 2014-09 | Impact of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,473) |  | $ (294) |
Cost of sales | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,644) |  | (353) |
Gross profit | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171 |  | 59 |
Operating expenses | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (289) |  | 0 |
Operating income | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 460 |  | 59 |
Net income | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 328 |  | $ 37 |
Diluted | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.00 |
[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.
[2] | During fiscal 2019, we recorded a discrete tax benefit of $0.1 million in the first quarter of fiscal 2019 resulting from reversal of income tax reserves due to the expiration of the statutes of limitation as well as excess tax benefits recognized on stock compensation. In the second quarter of fiscal 2019 we recorded a discrete tax benefit of $0.2 million related to the recording of federal and state net operating losses as well as the reversal of income tax reserves due to the expiration of the statutes of limitation. In the third quarter of fiscal 2019, we recorded a discrete tax benefit of $0.3 million from reversal of income tax reserves due to the expiration of the statutes of limitation as well as adjustments from the filing of the federal and foreign income tax returns.During fiscal 2018, we recorded discrete tax expense of $2.8 million in the first quarter of fiscal 2018, $0.2 million in the second quarter of fiscal 2018 and $0.1 million in the third quarter of fiscal 2018 resulting from new U.S. tax legislation that was enacted during the first quarter of fiscal 2018 and the adoption of ASU 2016-09 relating to the accounting for the tax effects of stock compensation. In the fourth quarter of fiscal 2018, we recorded a net tax benefit of $1.5 million for the release of a valuation allowance against U.S. federal capital loss carryforward due to expected capital gains tax in fiscal 2019 resulting from the sale of our corporate headquarters building in October 2018 (see Note 5 to the consolidated financial statements).
[3] | The impact of the adoption of ASU 2014-09 solely impacts the results of our IoT Solutions segment.

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