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Commitments (Summary of Company's Rent Expense) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Rent expense $ 1,842 $ 1,276 $ 504
Continuing Operations [Member]      
Rent expense $ 1,842 $ 1,276 1,506
Discontinued Operations [Member]      
Sublease rent     $ (1,002)