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Commitments and Contingencies - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2016
Employee Retirement Plan [Abstract]      
Employer's matching contribution $ 234 $ 227  
Aquadex Product Line [Member]      
Contingent Consideration [Abstract]      
Fair value of contingent consideration     $ 126
Contingent consideration   $ 0