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

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The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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