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Commitments and Contingencies - (Details) - USD ($)
12 Months Ended
Aug. 05, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Leases [Abstract]        
Rent expense related to operating leases   $ 290,000 $ 286,000  
Future minimum lease payments [Abstract]        
2018   212,000    
2019   60,000    
2020   7,000    
2021   0    
2022   0    
Employee Retirement Plan [Abstract]        
Employer's matching contribution   138,000 $ 122,000  
Aquadex Product Line [Member]        
Inventory Purchase Commitments [Abstract]        
Remaining inventory obligation   1,200,000   $ 2,400,000
Inventory purchases   $ 1,200,000    
Contingent Consideration [Abstract]        
Sale or disposal of business assets threshold for contingent consideration $ 4,000,000      
Percentage of additional payments on disposes of business assets 40.00%      
Aquadex Product Line [Member] | Maximum [Member]        
Inventory Purchase Commitments [Abstract]        
Agreement term   18 months    
Contingent Consideration [Abstract]        
Contingent consideration period   3 years