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Aquadex Acquisition (FY) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 05, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Item]              
Revenue   $ 1,363 $ 957 $ 3,499 $ 2,722 $ 3,553 $ 1,289
Amounts recognized for assets acquired [Abstract]              
Goodwill           0 189
Aquadex Product Line [Member]              
Business Acquisition [Line Item]              
Revenue           $ 3,600 1,200
Total purchase consideration [Abstract]              
Cash consideration $ 4,000            
Common stock consideration 950            
Fair value of contingent consideration 126            
Total purchase consideration $ 5,076            
Common stock issued in acquisition (in shares) 1,666            
Closing market value (in dollars per share) $ 570            
Contingent consideration payable in excess of sale or disposal of business assets 40.00%     40.00%      
Sale or disposal of business assets threshold for contingent consideration $ 4,000     $ 4,000      
Acquisition related expenses 900            
Amounts recognized for assets acquired [Abstract]              
Capital lease asset 307            
Intangible assets 4,580            
Total identifiable assets acquired 4,887            
Goodwill 189            
Total purchase consideration $ 5,076            
Pro forma information [Abstract]              
Pro forma net sales             3,160
Pro forma net loss from operations             $ (15,340)
Pro forma basic and diluted net loss per share (in dollars per share)             $ (464.84)
Aquadex Product Line [Member] | Maximum [Member]              
Business Acquisition [Line Item]              
Agreement term           18 months  
Total purchase consideration [Abstract]              
Contingent consideration period       3 years   3 years