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Notes Payable - Future Principal Payments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Credit Facility        
Estimated future principal payments        
Interest expense $ 10 $ 100 $ 100 $ 400