Annual report pursuant to Section 13 and 15(d)

Intangible Assets - Summary of Future Estimated Annual Amortization Expense (Detail)

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Intangible Assets - Summary of Future Estimated Annual Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2018 $ 1,011
2019 1,011
2020 1,004
Total $ 3,026