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Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 423 $ 166 $ 392
Additions Charged to Costs and Expenses 3 332 75
Deductions (384) (75) (301)
Balance at End of Period 42 423 166
Inventory Reserve      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 4,020 2,995 2,602
Additions Charged to Costs and Expenses   1,025 393
Deductions (426)    
Balance at End of Period $ 3,594 $ 4,020 $ 2,995