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Commitments and Contingencies - Estimated Annual Lease, Royalty, and Employment Agreement Expenses (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 2,605
2020 2,370
2021 1,625
2022 1,673
2023 205
Thereafter 0
Total Contractual commitments $ 8,478