Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue	$ 24,036	$ 30,176
Cost of revenue	16,122	20,133
Gross profit	7,914	10,043
Operating expense:
Selling, general, and administrative	4,819	5,578
Research and development	3,800	2,199
Loss on sale of assets	107	0
Total operating expense	8,726	7,777
Operating (loss) income	(812)	2,266
Other income (expense):
Interest income, net	111	23
Foreign exchange gain (loss)	286	(403)
Total other income (expense)	397	(380)
(Loss) income from continuing operations before income tax benefit (expense)	(415)	1,886
Income tax benefit (expense)	333	(120)
(Loss) income from continuing operations	(82)	1,766
Loss from discontinued operations, net of tax	0	(9)
Net (loss) income	(82)	1,757
Foreign exchange translation adjustment	253	(260)
Comprehensive income	$ 171	$ 1,497
Net (loss) income per basic share:
Continuing operations (in usd per share)	$ 0.00	$ 0.07
Discontinued operations (in usd per share)	0.00	0.00
Net income per basic share (in usd per share)	0.00	0.07
Net (loss) income per diluted share:
Continuing operations (in usd per share)	0.00	0.07
Discontinued operations (in usd per share)	0.00	0.00
Net income per diluted share (in usd per share)	$ 0.00	$ 0.07
Weighted-average number of basic shares outstanding (in shares)	27,032	26,279
Weighted-average number of basic shares outstanding (in shares)	27,032	27,039