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Marketable Equity investment - Additional Information (Detail) - USD ($) | 1 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Mar. 31, 2016
Investment [Line Items] |  |
Carrying value of investment |  | $ 0
Aduro |  |
Investment [Line Items] |  |
Preferred shares converted to common stock | 396,700 |

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