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Summary of Significant Accounting Policies (Adoption of ASC 606) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
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Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 65,662 |  | $ 62,716 |  | $ 54,791 |  | $ 45,197 |  | $ 45,105 |  | $ 45,739 |  | $ 45,615 |  | $ 45,175 |  | $ 228,366 | $ 181,634 | $ 203,005 |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,871 | 1,444 | 887 |  |
Total cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,483 | 94,460 | 103,325 |  |
Gross profit | 30,963 |  | 29,329 |  | 26,654 |  | 21,937 |  | 21,334 |  | 22,485 |  | 21,902 |  | 21,453 |  | 108,883 | 87,174 | 99,680 |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,561 | 78,367 | 82,575 |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,322 | 8,807 | 17,105 |  |
Net income | $ 3,608 | [1],[2] | $ 2,621 | [1],[2] | $ (357) | [1],[2] | $ (4,569) | [1],[2] | $ 4,343 | [1],[2] | $ 1,335 | [1],[2] | $ 1,331 | [1],[2] | $ 2,357 | [1],[2] | $ 1,303 | $ 9,366 | $ 16,708 |  |
Net (loss) income per common share, diluted (USD per share) | $ 0.13 |  | $ 0.09 |  | $ (0.01) |  | $ (0.17) |  | $ 0.16 |  | $ 0.05 |  | $ 0.05 |  | $ 0.09 |  | $ 0.05 | $ 0.35 | $ 0.64 | [3] |
Accounts receivable, net | $ 50,817 |  |  |  |  |  |  |  | $ 28,855 |  |  |  |  |  |  |  | $ 50,817 | $ 28,855 |  |  |
Other current assets | 2,613 |  |  |  |  |  |  |  | 3,032 |  |  |  |  |  |  |  | 2,613 | 3,032 |  |  |
Deferred tax assets | 6,665 |  |  |  |  |  |  |  | 9,211 |  |  |  |  |  |  |  | 6,665 | 9,211 |  |  |
Other non-current assets | 1,291 |  |  |  |  |  |  |  | 269 |  |  |  |  |  |  |  | 1,291 | 269 |  |  |
Other current liabilities | 2,413 |  |  |  |  |  |  |  | 2,113 |  |  |  |  |  |  |  | 2,413 | 2,113 |  |  |
Other non-current liabilities | 510 |  |  |  |  |  |  |  | 654 |  |  |  |  |  |  |  | 510 | 654 |  |  |
Stockholders' equity | 330,280 |  |  |  |  |  |  |  | 319,144 |  |  |  |  |  |  |  | 330,280 | 319,144 | $ 300,029 |  | $ 274,938
Hardware product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,050 | 166,480 | 196,101 |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,332 | 85,369 | 97,776 |  |
Services and solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,316 | 15,154 | 6,904 |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,280 | 7,647 | $ 4,662 |  |
As Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 228,366 | 181,634 |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,871 | 1,444 |  |  |
Total cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,483 | 94,460 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108,883 | 87,174 |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,561 | 78,367 |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,322 | 8,807 |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,303 | $ 9,366 |  |  |
Net (loss) income per common share, diluted (USD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.35 |  |  |
Accounts receivable, net | 50,817 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,817 |  |  |  |
Other current assets | 2,613 |  |  |  |  |  |  |  | 3,032 |  |  |  |  |  |  |  | 2,613 | $ 3,032 |  |  |
Deferred tax assets | 6,665 |  |  |  |  |  |  |  | 9,211 |  |  |  |  |  |  |  | 6,665 | 9,211 |  |  |
Other non-current assets | 1,291 |  |  |  |  |  |  |  | 269 |  |  |  |  |  |  |  | 1,291 | 269 |  |  |
Other current liabilities | 2,413 |  |  |  |  |  |  |  | 2,113 |  |  |  |  |  |  |  | 2,413 | 2,113 |  |  |
Other non-current liabilities | 510 |  |  |  |  |  |  |  | 654 |  |  |  |  |  |  |  | 510 | 654 |  |  |
Stockholders' equity | 330,280 |  |  |  |  |  |  |  | 319,144 |  |  |  |  |  |  |  | 330,280 | 319,144 |  |  |
As Reported | Hardware product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,050 | 166,480 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,332 | 85,369 |  |  |
As Reported | Services and solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,316 | 15,154 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,280 | 7,647 |  |  |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 226,893 | 181,340 |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,871 | 1,444 |  |  |
Total cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 117,839 | 94,107 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 109,054 | 87,233 |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106,272 | 78,367 |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,782 | 8,866 |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,631 | $ 9,403 |  |  |
Net (loss) income per common share, diluted (USD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.35 |  |  |
Accounts receivable, net | 49,819 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,819 |  |  |  |
Other current assets | 3,498 |  |  |  |  |  |  |  | 3,204 |  |  |  |  |  |  |  | 3,498 | $ 3,204 |  |  |
Deferred tax assets | 6,600 |  |  |  |  |  |  |  | 9,278 |  |  |  |  |  |  |  | 6,600 | 9,278 |  |  |
Other non-current assets | 2,490 |  |  |  |  |  |  |  | 537 |  |  |  |  |  |  |  | 2,490 | 537 |  |  |
Other current liabilities | 3,011 |  |  |  |  |  |  |  | 2,582 |  |  |  |  |  |  |  | 3,011 | 2,582 |  |  |
Other non-current liabilities | 720 |  |  |  |  |  |  |  | 807 |  |  |  |  |  |  |  | 720 | 807 |  |  |
Stockholders' equity | 330,493 |  |  |  |  |  |  |  | 319,029 |  |  |  |  |  |  |  | 330,493 | 319,029 |  |  |
ASU 2014-09 | Hardware product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 191,050 | 166,480 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,332 | 85,369 |  |  |
ASU 2014-09 | Services and solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,843 | 14,860 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,636 | 7,294 |  |  |
ASU 2014-09 | Impact of Adoption |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,473) | (294) |  |  |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Total cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,644) | (353) |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 171 | 59 |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (289) | 0 |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 460 | 59 |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 328 | $ 37 |  |  |
Net (loss) income per common share, diluted (USD per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.00 |  |  |
Accounts receivable, net | (998) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (998) |  |  |  |
Other current assets | 885 |  |  |  |  |  |  |  | 172 |  |  |  |  |  |  |  | 885 | $ 172 |  |  |
Deferred tax assets | (65) |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  |  | (65) | 67 |  |  |
Other non-current assets | 1,199 |  |  |  |  |  |  |  | 268 |  |  |  |  |  |  |  | 1,199 | 268 |  |  |
Other current liabilities | 598 |  |  |  |  |  |  |  | 469 |  |  |  |  |  |  |  | 598 | 469 |  |  |
Other non-current liabilities | 210 |  |  |  |  |  |  |  | 153 |  |  |  |  |  |  |  | 210 | 153 |  |  |
Stockholders' equity | $ 213 |  |  |  |  |  |  |  | $ (115) |  |  |  |  |  |  |  | 213 | (115) |  |  |
ASU 2014-09 | Impact of Adoption | Hardware product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
ASU 2014-09 | Impact of Adoption | Services and solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,473) | (294) |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,644) | $ (353) |  |  |
[1] | During fiscal 2018, we recorded net tax expenses of $1.5 million and in fiscal 2017, we recorded net tax benefits of $1.0 million, respectively. We recorded 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 18 to the Consolidated Financial Statements) along with U.S., state and foreign prior year true-up provision to return.We recorded a benefit of $0.1 million in the first quarter of fiscal 2017 resulting from reversal of income tax reserves due to the expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions. In the third quarter of fiscal 2017, we recorded a tax benefit of $0.7 million from reversal of income tax reserves due to the expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions. In the fourth quarter of fiscal 2017, we recorded a net tax benefit of $0.2 million, primarily from the reversal of income tax reserves due to the expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions and state and foreign prior year true-up provision to return.
[2] | For continuing operations, we recorded business restructuring charges of $0.2 million ($0.1 million after tax) in the third quarter of fiscal 2018 and $0.1 million ($0.1 million after tax) in the fourth quarter of fiscal 2018. We also recorded business restructuring charges of $2.5 million ($1.6 million after tax) in the third quarter of fiscal 2017.
[3] | Earnings per share presented are calculated by line item and may not add due to the use of rounded amounts.

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