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Debt - Xcel Term Loan Remaining Principal Payments (Details) - Xcel Term Loan - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt    
2020 $ 1,500  
2021 2,800  
2022 8,950  
2023 5,000  
Total $ 18,250 $ 19,000