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Commitments and Contingencies - Future Minimum Debt and Lease Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
2018 $ 5,192
2019 8,877
Total 14,069
Payment on Lease Office and Manufacturing Space [Member]  
Contractual Obligation Fiscal Year Maturity Schedule [Line Items]  
2018 589
2019 565
2020 541
2021 541
2022 138
Total $ 2,374