XML 27 R35.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock-Based Compensation - Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Costs and expenses:        
Total stock-based compensation expense $ 2,129 $ 1,391 $ 6,165 $ 4,098
Research and development [Member]
        
Costs and expenses:        
Total stock-based compensation expense 1,182 732 3,418 2,140
General and administrative [Member]
        
Costs and expenses:        
Total stock-based compensation expense $ 947 $ 659 $ 2,747 $ 1,958