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Intangible Assets and Royalty Agreement - Expected Future Amortization of Intangible Assets (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 $ 2,034
2018 1,829
2019 1,829
2020 1,622
2021 1,622
Thereafter 12,874
Net book value $ 21,810