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Intangible Assets and Royalty Agreement - Estimated Future Amortization Expense for Intangible Assets (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Estimated future amortization expense [Abstract]  
2017 $ 1,518
2018 1,830
2019 1,830
2020 1,622
2021 1,622
Thereafter 12,908
Net book value $ 21,330