Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2013
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Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
|
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||||
Share Based Compensation | $ 3,736 | $ 2,069 | $ 8,002 | $ 4,391 |
Research and Development Expense
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Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||||
Share Based Compensation | 1,027 | 938 | 2,350 | 1,741 |
General and Administrative Expense
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Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] | ||||
Share Based Compensation | $ 2,709 | $ 1,131 | $ 5,652 | $ 2,650 |