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Restructuring Expenses - Schedule of Restructuring and Related Costs (Detail) - Lease Liability [Member] - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]    
Restructuring reserve balance $ 604 $ 820
Charges 0 0
Payments/Utilizations (109) (216)
Restructuring reserve balance $ 495 $ 604