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Charges Related to Restructuring Activities - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Operation
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 0    
Restructuring liability related to lease termination costs 439 $ 478  
Lease Termination Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 0    
Restructuring liability related to lease termination costs 415 478  
Infrastructure and Manufacturing Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges   $ 100  
Maximum [Member] | Infrastructure and Manufacturing Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 100    
Asia-Pacific [Member]      
Restructuring Cost and Reserve [Line Items]      
Number of reconfigured operations | Operation     1