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Income Taxes, Components of Income Tax Benefit (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Current [Abstract]            
United States and state         $ 0 $ 0
Foreign, net         (6) 54
Deferred [Abstract]            
United States and state         0 0
Foreign         0 0
Total income tax benefit (expense) $ (1) $ (5) $ (3) $ (6) $ (6) $ 54