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Stock-Based Compensation - Aggregate Stock-Based Compensation Expense Related to the Issuance of Stock Option Awards (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] | ||||
| Total | $ 611 | $ 577 | $ 1,458 | $ 876 |
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Research and Development [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Total | 252 | 445 | 774 | 625 |
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General and Administrative Expense [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Total | $ 359 | $ 132 | $ 684 | $ 251 |