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Acquisitions - Purchase Consideration (Detail) (USD $) | Sep. 30, 2013 | Jan. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Aug. 10, 2012 | Sep. 30, 2011 | Oct. 21, 2011 Roche | Apr. 05, 2012 Alvos acquisition
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Promissory note due Roche |  |  |  |  |  |  | $ 50,000 |
Contingent consideration | 1,595,273 |  |  | 173,621 |  |  | 84,935 | 88,686
Share consideration |  |  |  |  |  |  | 5,133,879 | 2,000,000
Total purchase consideration |  |  |  |  |  |  | $ 5,268,814 | $ 2,088,686
Shares issued |  |  |  |  |  |  | 1,288,158 | 315,457
Sale of stock, price per share |  | $ 2.12 | $ 2.26 |  | $ 2.76 |  |  | $ 6.34

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