Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenue	$ 174,778	$ 168,147	$ 163,781
Cost of revenue	142,104	139,949	145,955
Gross profit	32,674	28,198	17,826
Operating expense (income):
Selling, general, and administrative	32,785	27,419	34,861
Research and development	19,097	19,972	22,338
Impairment	0	0	1,425
Litigation settlements, net	0	0	1,050
Flood-related loss	0	0	5,519
Flood-related insurance proceeds	0	(19,000)	(9,000)
Gain on sale of assets	(100)	(413)	(2,742)
Total operating expense	51,782	27,978	53,451
Operating (loss) income	(19,108)	220	(35,625)
Other income (expense):
Interest expense, net	(522)	(800)	(677)
Foreign exchange gain	10	356	45
Loss from equity method investment	0	0	(1,201)
Gain on sale of investment	307	0	0
Gain on sale of equity method investment	0	4,800	0
Change in fair value of financial instruments	34	515	(69)
Other income	51	17	0
Total other (expense) income	(120)	4,888	(1,902)
(Loss) income before income taxes	(19,228)	5,108	(37,527)
Income tax benefit (expense)	24,080	(120)	(1,644)
Net income (loss)	4,852	4,988	(39,171)
Foreign exchange translation adjustment	214	247	464
Comprehensive income (loss)	$ 5,066	$ 5,235	$ (38,707)
Per share data:
Net income (loss) per basic share	$ 0.16	$ 0.19	$ (1.66)
Net income (loss) per diluted share	$ 0.16	$ 0.19	$ (1.66)
Weighted-average number of basic shares outstanding	30,453	26,531	23,559
Weighted-average number of diluted shares outstanding	30,777	26,812	23,559