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Commitments and Contingencies - Future Minimum Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 31, 2015
Purchase commitments    
Total $ 1,821  
2020 607 $ 600
2021 607  
2022 607  
2023 0  
2024 0  
More than 5 Years $ 0