Acquisitions - Purchase Consideration (Detail) (USD $)	Jun. 30, 2013	May 31, 2013	Sep. 30, 2012	Aug. 10, 2012	Sep. 30, 2011	Oct. 21, 2011 Roche	Apr. 15, 2012 Alvos acquisition
Business Acquisition [Line Items]
Promissory note due Roche						$ 50,000
Contingent consideration	173,621		173,621		0	84,935	88,686
Shares issued						5,133,879	315,457
Total purchase consideration						5,268,814	2,088,686
Sale of stock, price per share		$ 1.83		$ 2.76			$ 6.34
Share consideration							$ 2,000,000