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Stock Based Compensation - Stock-Based Compensation Expense (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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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 1,468 | $ 1,272 | $ 2,734 | $ 2,325 |
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Research and Development
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | 846 | 663 | 1,517 | 1,197 |
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General and Administrative
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| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 622 | $ 609 | $ 1,217 | $ 1,128 |