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Commitments and Contingencies - Schedule of Future Minimum Purchase Commitments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 2,948
2020 2,481
2021 2,663
2022 402
2023 0
Thereafter 1,654
Future commitments $ 10,148