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Acquisitions - Purchase Consideration (Detail) (USD $) | Mar. 31, 2013 | Sep. 30, 2012 | Aug. 10, 2012 | Mar. 31, 2013 Roche [Member] | Oct. 21, 2011 Roche [Member] | Mar. 31, 2013 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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