Intangible Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Amortization Of Intangible Assets [Line Items]
Amortization of intangible assets	$ 516	$ 585	$ 1,042	$ 1,165
Estimated amortization expense for intangible assets remainder of fiscal year 2014	967		967
2015	1,777		1,777
2016	1,432		1,432
2017	1,163		1,163
2018	1,140		1,140
2019	1,099		1,099
Trademarks, licenses and patents [Member] | Illumigene Molecular Technology [Member]
Amortization Of Intangible Assets [Line Items]
Licensing rights acquired			$ 1,638
Weighted average amortization period			8 years 6 months