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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.