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Debt - Schedule of Minimum Principal Payments on Term Loan (Details) - 2015 Term Loan
$ in Thousands
Mar. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2019 $ 5,625
2020 10,313
2021 13,125
2022 15,000
2023 17,812
Thereafter 9,375
Senior secured term loan payable, net $ 71,250