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Collaborative Arrangement - Additional Information (Detail) (License and Collaboration Agreement with Sanofi, USD $) | 0 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 23, 2014 | Aug. 11, 2014 | Sep. 30, 2014 | Sep. 23, 2014 | Aug. 11, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Up-front fee |  |  | $ 150,000,000 |  |
Potential milestone payment |  |  |  |  | 775,000,000
Profits and losses sharing percentage |  | 35.00% |  |  |
Maximum secured loan facility |  |  |  | 175,000,000 |
Senior notes, effective interest rate |  |  |  | 8.50% |
Prepayment of loan percentage of net cash proceeds sale | 100.00% |  |  |  |
Development and Manufacturing Milestone Events |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payment |  | 75,000,000 |  |  | 75,000,000
Regulatory Approvals |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payment |  | 50,000,000 |  |  | 50,000,000
Product Sales Milestones |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Potential milestone payment |  | 650,000,000 |  |  | 650,000,000
Sanofi-Aventis Deutschland GmbH |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Profits and losses sharing percentage |  | 65.00% |  |  |
Collaboration revenue recognized |  |  | 0 |  |
Deferred revenue |  |  | $ 150,000,000 |  |

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