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Aquadex Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Item]      
Revenue   $ 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%    
Sale or disposal of business assets threshold for contingent consideration $ 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