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Patents and Other Intangible Assets - Schedule of Future Amortization Expense (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
2019 $ 6,604  
2020 6,205  
2021 6,146  
2022 6,138  
2023 5,495  
Thereafter 21,309  
Patents and other intangible assets, net $ 51,897 $ 10,461