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Intangible Assets - Estimated Future Amortization (Details) - Licensing Agreements - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Finite Lived Intangible Assets    
2020 $ 3,635  
2021 4,847  
2022 4,847  
2023 4,847  
2024 4,847  
Thereafter 38,685  
Total intangible asset, net $ 61,708 $ 62,920