Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 81,685	$ 55,514	$ 60,971
Cost of revenue	52,994	43,400	48,705
Gross profit	28,691	12,114	12,266
Operating expense (income):
Selling, general, and administrative	24,711	23,239	18,492
Research and development	9,119	9,306	10,509
Gain from change in estimate on ARO obligation	(845)	0	0
Flood-related insurance proceeds	0	0	(7,790)
Loss (gain) on sale of assets	228	(100)	0
Total operating expense	33,213	32,445	21,211
Operating loss	(4,522)	(20,331)	(8,945)
Other income (expense):
Interest income (expense), net	75	(522)	(800)
Foreign exchange (loss) gain	(138)	(7)	283
Gain on sale of investment	0	307	0
Change in fair value of financial instruments	122	34	515
Other income	0	51	0
Total other income (expense)	59	(137)	(2)
Loss from continuing operations before income tax benefit	(4,463)	(20,468)	(8,947)
Income tax benefit	2,191	24,550	3,393
(Loss) income from continuing operations	(2,272)	4,082	(5,554)
Income from discontinued operations, net of tax	65,372	770	10,542
Net income	63,100	4,852	4,988
Foreign exchange translation adjustment	(990)	214	247
Comprehensive income	$ 62,110	$ 5,066	$ 5,235
Net (loss) income per basic share:
Net (loss) income per basic share, continuing operations (in usd per share)	$ (0.08)	$ 0.13	$ (0.21)
Net income per basic share, discontinued operations (in usd per share)	2.18	0.03	0.40
Net income per basic share (in usd per share)	2.10	0.16	0.19
Net (loss) income per diluted share:
Net (loss) income per diluted share, continuing operations (in usd per share)	(0.08)	0.13	(0.21)
Net income per diluted share, discontinued operations (in usd per share)	2.18	0.03	0.40
Net income per diluted share (in usd per share)	$ 2.10	$ 0.16	$ 0.19
Weighted-average number of basic shares outstanding (in shares)	30,012	30,453	26,531
Weighted-average number of diluted shares outstanding (in shares)	30,012	30,777	26,531