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Debt - Contractual Maturities of Note Payable Secured by Royalty Interest (Details) - Notes Payable - Note payable secured by royalty interest
$ in Thousands
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2020 $ 454
2021 378
2022 434
2023 499
2024 570
Thereafter $ 8,103