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Acquisitions - Purchase Consideration (Detail) (USD $)	Dec. 31, 2012	Sep. 30, 2012	Aug. 10, 2012	Dec. 31, 2012 Roche [Member]	Oct. 21, 2011 Roche [Member]	Dec. 31, 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)	(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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