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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2013
Segment
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| Summary Of Significant Accounting Policies [Line Items] | |
| Property and equipment, estimated useful lives | 3 years |
| Reportable segment | 1 |
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Leasehold Improvements [Member] | Minimum [Member]
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| Summary Of Significant Accounting Policies [Line Items] | |
| Property and equipment, estimated useful lives | 4 years |
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Leasehold Improvements [Member] | Maximum [Member]
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| Summary Of Significant Accounting Policies [Line Items] | |
| Property and equipment, estimated useful lives | 6 years |
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Merck KGaA [Member]
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| Summary Of Significant Accounting Policies [Line Items] | |
| Merck KGaA's percentage share of worldwide development expenses | 70.00% |
| Upfront and milestone payments received to date | $ 110.0 |
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Merck KGaA [Member] | Subsequent Event [Member]
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| Summary Of Significant Accounting Policies [Line Items] | |
| Upfront and milestone payments received to date | $ 12.5 |
| X | ||||||||||
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- Definition
Collaboration Upfront and Milestone Payments received and/or earned. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Worldwide development expenses share percentage. No definition available.
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| X | ||||||||||
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- Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. No definition available.
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| X | ||||||||||
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- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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