Summary of Significant Accounting Policies (Adoption of ASC 606) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	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.