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Patents Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2018 $ 3,215
2019 10,876
2020 1,682
2021 822
2022 817
Thereafter 735
Total expected amortization expense $ 18,147