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Debt - Principal Repayments (Details) - Debt Financing Agreement - Silicon Valley Bank and MidCap Financial Services - Line of Credit - Revolving Credit Facility
$ in Thousands
Sep. 30, 2018
USD ($)
Line of Credit Facility [Line Items]  
2018 $ 417
2019 5,000
2020 5,000
2021 7,083
2022 0
Thereafter 0
Total principal payments on debt $ 17,500