Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Operating Income (Loss) [Abstract]
Revenue	$ 23,018	$ 21,194	$ 19,057	$ 18,416	$ 14,302	$ 13,596	$ 12,953	$ 14,663	$ 81,685	$ 55,514	$ 60,971
Cost of revenue	13,568	13,511	12,678	13,237	10,136	10,937	10,055	12,272	52,994	43,400	48,705
Gross profit	9,450	7,683	6,379	5,179	4,166	2,659	2,898	2,391	28,691	12,114	12,266
Operating expense (income):
Selling, general, and administrative	5,587	4,543	5,954	8,627	7,891	5,364	4,328	5,656	24,711	23,239	18,492
Research and development	2,649	2,274	2,022	2,174	2,466	2,340	2,676	1,824	9,119	9,306	10,509
Gain from change in estimate on ARO obligation	0	0	0	(845)					(845)	0	0
Loss (gain) on sale of assets	0	0	0	228	(100)	0	0	0	228	(100)	0
Total operating expense	8,236	6,817	7,976	10,184	10,257	7,704	7,004	7,480	33,213	32,445	21,211
Operating loss	1,214	866	(1,597)	(5,005)	(6,091)	(5,045)	(4,106)	(5,089)	(4,522)	(20,331)	(8,945)
Other income (expense):
Interest income (expense), net	36	4	165	(130)	(145)	(134)	(117)	(126)	75	(522)	(800)
Foreign exchange (loss) gain	(239)	50	(6)	57	(5)	(12)	(90)	100	(138)	(7)	283
Gain on sale of investment					0	0	17	290	0	307	0
Change in fair value of financial instruments	0	0	86	36	(5)	110	7	(78)	122	34	515
Other income					51	0	0	0	0	51	0
Total other income (expense)	(203)	54	245	(37)	(104)	(36)	(183)	186	59	(137)	(2)
Loss from continuing operations before income tax benefit	1,011	920	(1,352)	(5,042)	(6,195)	(5,081)	(4,289)	(4,903)	(4,463)	(20,468)	(8,947)
Income tax benefit	339	(456)	396	1,912	23,171	732	(433)	1,080	2,191	24,550	3,393
(Loss) income from continuing operations	1,350	464	(956)	(3,130)	16,976	(4,349)	(4,722)	(3,823)	(2,272)	4,082	(5,554)
Income from discontinued operations, net of tax	130	1,976	4,008	59,258	(1,488)	1,199	(710)	1,769	65,372	770	10,542
Net income	$ 1,480	$ 2,440	$ 3,052	$ 56,128	$ 15,488	$ (3,150)	$ (5,432)	$ (2,054)	$ 63,100	$ 4,852	$ 4,988
Net income (loss) per basic and diluted shares:
Net (loss) income per basic share, continuing operations (in usd per share)	$ 0.05	$ 0.02	$ (0.03)	$ (0.10)	$ 0.55	$ (0.14)	$ (0.16)	$ (0.13)	$ (0.08)	$ 0.13	$ (0.21)
Net income per basic share, discontinued operations (in usd per share)	0.01	0.06	0.13	1.90	(0.05)	0.04	(0.02)	0.06	2.18	0.03	0.40
Net income per basic share (in usd per share)	0.06	0.08	0.10	1.80	0.50	(0.10)	(0.18)	(0.07)	2.10	0.16	0.19
Net (loss) income per diluted share, continuing operations (in usd per share)	0.05	0.02	(0.03)	(0.10)	0.55	(0.14)	(0.16)	(0.13)	(0.08)	0.13	(0.21)
Net income per diluted share, discontinued operations (in usd per share)	0.01	0.06	0.13	1.90	(0.05)	0.04	(0.02)	0.06	2.18	0.03	0.40
Net income per diluted share (in usd per share)	$ 0.06	$ 0.08	$ 0.10	$ 1.80	$ 0.50	$ (0.10)	$ (0.18)	$ (0.07)	$ 2.10	$ 0.16	$ 0.19
Weighted-average number of basic shares outstanding (in shares)	25,615	31,203	32,077	31,217	30,752	30,656	30,392	29,938	30,012	30,453	26,531
Weighted-average number of diluted shares outstanding (in shares)	25,896	31,432	32,077	31,217	30,992	30,656	30,392	29,938	30,012	30,777	26,531