Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Income Statement [Abstract]
Revenue	$ 42,247	$ 42,277	$ 86,458	$ 91,583
Cost of revenue	35,381	34,444	69,457	72,802
Gross profit	6,866	7,833	17,001	18,781
Operating expense (income):
Selling, general, and administrative	6,911	6,771	14,883	13,675
Research and development	5,204	4,112	9,607	9,502
Flood-related insurance proceeds	0	(14,808)	0	(19,000)
Gain on sale of assets	0	(413)	0	(413)
Total operating expense (income)	12,115	(4,338)	24,490	3,764
Operating (loss) income	(5,249)	12,171	(7,489)	15,017
Other income (expense):
Interest expense, net	(117)	(186)	(243)	(424)
Foreign exchange (loss) gain	(90)	(21)	10	80
Gain on sale of investment	17	0	307	0
Change in fair value of financial instruments	7	(267)	(71)	(30)
Total other (expense) income	(183)	(474)	3	(374)
(Loss) income before income tax expense	(5,432)	11,697	(7,486)	14,643
Income tax expense	0	0	0	(120)
Net (loss) income	(5,432)	11,697	(7,486)	14,523
Foreign exchange translation adjustment	(43)	(76)	2	(7)
Comprehensive (loss) income	$ (5,475)	$ 11,621	$ (7,484)	$ 14,516
Per share data:
Net (loss) income per basic share (in dollars per share)	$ (0.18)	$ 0.44	$ (0.25)	$ 0.55
Net (loss) income per diluted share (in dollars per share)	$ (0.18)	$ 0.44	$ (0.25)	$ 0.54
Weighted-average number of basic shares outstanding	30,392	26,310	30,162	26,142
Weighted-average number of diluted shares outstanding	30,392	26,642	30,162	26,432