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Valuation And Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 25 $ 0 $ 9
Additions 0 25 0
Deduction 0 0 9
Balance at end of period $ 25 $ 25 $ 0