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Commitments and Contingencies - Obligations Under Non-cancelable Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 1,240
2020 1,464
2021 1,392
2022 1,394
2023 1,397
Thereafter 6,507
Total future minimum payments due $ 13,394