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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Less unamortized discount $ 0 $ (282)
Long-term debt, net, less current portion 0 79,721
Term loan    
Debt Instrument [Line Items]    
Debt 0 80,438
Less unamortized term loan debt issuance costs $ 0 $ (435)