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Restructuring Charges - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 22, 2015
Employee
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restructuring And Related Cost [Line Items]          
Company workforce reduction percentage under restructuring plan 20.00%        
Number of employees eliminated | Employee 15        
Restructuring charges   $ 2,600   $ 2,573  
Stock-based compensation expense     $ 11,416 $ 11,505 $ 8,567
RSUs | Restricted Stock Units [Member]          
Restructuring And Related Cost [Line Items]          
Stock-based compensation expense   $ 1,000