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Revenue - Summary of Company's Revenue (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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| Deferred Revenue Disclosure [Abstract] | ||||
| Government grants | $ 151 | $ 418 | $ 516 | |
| Research and development agreements | 3,365 | 4,415 | 6,971 | 8,315 |
| Total | $ 3,365 | $ 4,566 | $ 7,389 | $ 8,831 |