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Intangible Assets and Royalty Agreement - Estimated Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Estimated future amortization expense [Abstract]  
2017 $ 237
2018 950
2019 950
2020 950
2021 942
Thereafter 5,340
Net book value $ 9,369