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Debt - Capital Lease Obligations - Future Minimum Payment Obligations (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2019 (remaining three months) $ 314
2020 1,176
2021 1,126
2022 358
Total outstanding principal balance $ 2,974