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Borrowings - Debt Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Maturities of Long-term Debt [Abstract]    
December 31, 2018 $ 0  
2019 0  
2020 4,444  
2021 17,778  
2022 17,778  
Total future minimum payments 40,000  
Amount representing debt discount (1,101)  
Total minimum payments $ 38,899 $ 38,700