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Patents Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
For the remainder of 2018 $ 2,464
2019 2,421
2020 1,561
2021 1,561
2022 1,486
Thereafter 188
Total expected amortization expense $ 9,681