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Patents and Other Intangible Assets - Schedule of Future Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 $ 2,352
2019 1,909
2020 1,366
2021 1,321
2022 1,314
Thereafter 2,199
Total future amortization expense $ 10,461