Quarterly report pursuant to Section 13 or 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
Jun. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2018 $ 111  
2019 223  
2020 223  
2021 223  
2022 223  
Thereafter 1,418  
Intangible assets, Net Carrying Value $ 2,421 $ 2,532