Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 91,998	$ 81,685	$ 55,514
Cost of revenue	61,044	52,994	43,400
Gross profit	30,954	28,691	12,114
Operating expense (income):
Selling, general, and administrative	20,734	24,711	23,239
Research and development	9,921	9,119	9,306
Recovery of previously incurred litigation related fees and expenses from arbitration award	(2,599)	0	0
Gain from change in estimate on ARO obligation	0	(845)	0
(Gain) loss on sale of assets	(41)	228	(100)
Total operating expense	28,015	33,213	32,445
Operating income (loss)	2,939	(4,522)	(20,331)
Other income (expense):
Interest income (expense), net	88	75	(522)
Foreign exchange loss	(394)	(138)	(7)
Gain on sale of investment	0	0	307
Change in fair value of financial instruments	0	122	34
Other income	0	0	51
Total other (expense) income	(306)	59	(137)
Income (loss) from continuing operations before income tax (expense) benefit	2,633	(4,463)	(20,468)
Income tax (expense) benefit	(14)	2,191	24,550
Income (loss) from continuing operations	2,619	(2,272)	4,082
Income from discontinued operations, net of tax	5,647	65,372	770
Net income	8,266	63,100	4,852
Foreign exchange translation adjustment	(268)	(990)	214
Comprehensive income	$ 7,998	$ 62,110	$ 5,066
Per share data:
Net income (loss) per basic share, continuing operations, (in usd per share)	$ 0.10	$ (0.08)	$ 0.13
Net income per basic share, discontinued operations (in usd per share)	0.22	2.18	0.03
Net income per basic share (in usd per share)	0.32	2.10	0.16
Net income (loss) per diluted share, continuing operations (in usd per share)	0.10	(0.08)	0.13
Net income per diluted share, discontinued operations (in usd per share)	0.21	2.18	0.03
Net income per diluted share (in usd per share)	$ 0.31	$ 2.10	$ 0.16
Weighted-average number of basic shares outstanding (in shares)	25,979	30,012	30,453
Weighted-average number of basic shares outstanding (in shares)	26,518	30,012	30,777