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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective income tax rate 3.00% 5.00% 56.00%
Increase in income tax benefit $ 2,900,000 $ 3,300,000  
Federal statutory income tax rate 21.00% 21.00% 21.00%
Valuation allowances against deferred tax assets $ 7,170,000 $ 3,218,000  
Net deferred tax liability 33,266,000 20,363,000  
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere 2,400,000    
State net operating loss carryforwards 3,400,000    
Foreign net operating loss carryforwards $ 2,300,000    
Operating loss carryforwards expiration date Dec. 31, 2025    
Research and development tax credit carryforwards $ 1,200,000    
Other tax credit $ 138,000    
Other tax credit expiration date Dec. 31, 2027    
Tax credit carryforwards expiration date Dec. 31, 2030    
Total uncertain tax liability including interest and penalties $ 2,800,000 4,000,000.0  
Uncertain tax liability recorded as reduction to deferred tax assets 300,000 300,000  
Uncertain tax liability recorded to non-current liability 2,500,000 $ 3,700,000  
Approximate amount of uncertain tax liability to be recognized 210,000,000,000    
Deferred tax asset imposed by Tax Act and CARES Act $ 2,700,000    
Interest deductibility threshold 30.00% 50.00%  
Interest deduction limit $ 15,800,000 $ 16,300,000  
Excess interest not deducted 2,700,000    
Foreign Authority [Member]      
Net deferred tax liability $ 141,000