Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 30,952	$ 22,376	$ 93,719	$ 66,398
Cost of revenue	20,110	14,964	61,796	44,563
Gross profit	10,842	7,412	31,923	21,835
Operating expense (income):
Selling, general, and administrative	5,815	6,125	17,065	15,771
Research and development	3,340	2,405	8,680	7,529
Impairments	0	0	468	0
Recovery of previously incurred litigation related fees and expenses from arbitration award	0	(2,599)	0	(2,599)
Gain on sale of assets	(322)	(41)	(322)	(41)
Total operating expense	8,833	5,890	25,891	20,660
Operating income	2,009	1,522	6,032	1,175
Other income (expense):
Interest income, net	77	32	146	40
Foreign exchange gain (loss)	53	(201)	(306)	(311)
Other income	316	0	316	0
Total other income (expense)	446	(169)	156	(271)
Income from continuing operations before income tax expense	2,455	1,353	6,188	904
Income tax expense	(19)	(175)	(131)	(22)
Income from continuing operations	2,436	1,178	6,057	882
(Loss) income from discontinued operations, net of tax	(11)	123	(27)	5,388
Net income	2,425	1,301	6,030	6,270
Foreign exchange translation adjustment	(1)	(185)	15	(230)
Comprehensive income	$ 2,424	$ 1,116	$ 6,045	$ 6,040
Net income (loss) per basic share:
Net income (loss) per basic share, continuing operations, (in usd per share)	$ 0.09	$ 0.05	$ 0.23	$ 0.04
Net income per basic share, discontinued operations (in usd per share)	0.00	0.00	0.00	0.20
Net income per basic share (in usd per share)	0.09	0.05	0.23	0.24
Net income (loss) per diluted share:
Net income (loss) per diluted share, continuing operations (in usd per share)	0.09	0.05	0.22	0.04
Net income per diluted share, discontinued operations (in usd per share)	0.00	0.00	0.00	0.20
Net income per diluted share (in usd per share)	$ 0.09	$ 0.05	$ 0.22	$ 0.24
Weighted-average number of basic shares outstanding (in shares)	26,833	26,103	26,577	25,913
Weighted-average number of basic shares outstanding (in shares)	27,816	26,269	27,548	26,186