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Related Party - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2009 | Dec. 31, 2012 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |  |
Square footage of leased space | 26,000 |  |
Net payable to Fidia |  | 0.7 | 0.8
Fidia Farmaceutici Spa |  |  |
Related Party Transaction [Line Items] |  |  |
Issuance of common stock in connection with acquisition | 1,981,192 |  |
Percentage of ownership interests |  | 14.30% | 14.50%

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