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Intangible Assets - Estimated Future Amortization (Details) - Licensing Agreements - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Finite Lived Intangible Assets    
2020 (remaining six months) $ 2,686  
2021 5,371  
2022 5,371  
2023 5,371  
2024 5,371  
Thereafter 44,258  
Total intangible asset, net $ 68,428 $ 62,920