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Revenue - Summary of Company's Revenue (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Deferred Revenue Disclosure [Abstract] | ||||
| Government grants | $ 253 | $ 365 | $ 418 | $ 365 |
| Research and development agreements | 2,206 | 2,412 | 3,606 | 3,900 |
| Total | $ 2,459 | $ 2,777 | $ 4,024 | $ 4,265 |