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Restructuring Charges - Additional information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Employee
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Employee
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 2,035 $ 6,040
Restructuring liability   1,376 3,028
Remaining accrual balance   1,376 $ 3,028
Twenty Sixteen Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Percentage of workforce reduction 18.00%    
Number of employees eliminated | Employee 155    
Restructuring charges $ 1,500 1,475  
Restructuring liability   1,500  
Remaining accrual balance   209  
Twenty Sixteen Restructuring Plan | Cost of Sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   400  
Twenty Sixteen Restructuring Plan | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   700  
Twenty Sixteen Restructuring Plan | Selling, General and Administrative Expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   400  
Twenty Fifteen Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Percentage of workforce reduction     26.00%
Number of employees eliminated | Employee     198
Restructuring charges   560 $ 6,040
Remaining accrual balance   $ 1,167 3,028
Twenty Fifteen Restructuring Plan | Cost of Sales      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     1,400
Twenty Fifteen Restructuring Plan | Research and development      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     1,300
Twenty Fifteen Restructuring Plan | Selling, General and Administrative Expenses      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges     $ 3,300