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Collaborations and License Agreements - Additional Information (Detail) (USD $)
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12 Months Ended | |
|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| Research and development | $ 23,027,578 | $ 15,486,476 |
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Licensing Agreements [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| License expiration period | On the later of 10 years after the first commercial sale of a product developed using the licensed compound or upon expiration of the patent rights | |
| Royalty payments | 0 | 0 |
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Takeda Pharmaceutical Company Limited [Member] | Collaborative Arrangement [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| R&D services revenue recognition period | 3 years | |
| Recognized revenue | 2,700,000 | 3,100,000 |
| Deferred revenue | 0 | 1,700,000 |
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Takeda Pharmaceutical Company Limited [Member] | Maximum [Member] | Development Milestones [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| Aggregate payment upon achievement of certain milestones | 500,000,000 | |
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Takeda Pharmaceutical Company Limited [Member] | Maximum [Member] | Sales-Based Milestones [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| Aggregate payment upon achievement of certain milestones | 250,000,000 | |
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University [Member] | Licensing Agreements [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| License expiration period | Upon expiration of the patent rights or 15 years subsequent to the first sale of products developed through this License. | |
| Number of common stock issued | 400,000 | |
| Research and development | 120,000 | |
| Other payments | 0 | 0 |
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University [Member] | Minimum [Member] | Licensing Agreements [Member]
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| Revenue Recognition, Multiple-deliverable Arrangements [Line Items] | ||
| Annual spending requirements for development and commercialization of technology expense | $ 1,000,000 | |