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Commitments and Contingencies - Future Minimum Debt and Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
2019 $ 8,653
2020 6,090
Total 14,743
Payment on Lease Office and Manufacturing Space [Member]  
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
2019 1,282
2020 638
2021 638
2022 192
Total $ 2,750