Annual report pursuant to Section 13 and 15(d)

Intangibles - Estimated Future Amortization Expense Related to Intangible Assets (Detail)

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Intangibles - Estimated Future Amortization Expense Related to Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2018 $ 223  
2019 223  
2020 223  
2021 223  
Thereafter 1,640  
Intangible assets, Net Carrying Value $ 2,532 $ 2,755