Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 21,532	$ 19,057	$ 44,022	$ 37,473
Cost of revenue	14,510	12,678	29,599	25,915
Gross profit	7,022	6,379	14,423	11,558
Operating expense (income):
Selling, general, and administrative	4,825	5,954	9,646	14,581
Research and development	2,564	2,022	5,124	4,196
Gain from change in estimate on ARO obligation	0	0	0	(845)
Loss on sale of assets	0	0	0	228
Total operating expense	7,389	7,976	14,770	18,160
Operating loss	(367)	(1,597)	(347)	(6,602)
Other income (expense):
Interest income, net	25	165	8	35
Foreign exchange gain (loss)	25	(6)	(110)	51
Change in fair value of financial instruments	0	86	0	122
Total other income (expense)	50	245	(102)	208
Loss from continuing operations before income tax (expense) benefit	(317)	(1,352)	(449)	(6,394)
Income tax benefit	155	396	153	2,308
Loss from continuing operations	(162)	(956)	(296)	(4,086)
Income from discontinued operations, net of tax	4,144	4,008	5,265	63,266
Net income	3,982	3,052	4,969	59,180
Foreign exchange translation adjustment	43	(8)	(45)	(719)
Comprehensive income	$ 4,025	$ 3,044	$ 4,924	$ 58,461
Per share data:
Net (loss) per basic and diluted share, continuing operations, (in usd per share)	$ (0.01)	$ (0.03)	$ (0.01)	$ (0.13)
Net income per basic and diluted share, discontinued operations (in usd per share)	0.16	0.13	0.20	2.00
Net income per basic and diluted share (in usd per share)	$ 0.15	$ 0.10	$ 0.19	$ 1.87
Weighted-average number of basic and diluted shares outstanding (in shares)	25,942	32,077	25,818	31,640