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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective income tax rate   (4.00%) 41.00% 32.00%
Provision to return adjustments   $ 78,000 $ (59,000) $ (86,000)
Reversal in uncertain tax positions   (67,000) (153,000) (869,000)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations   $ 254,000 $ 227,000 $ 904,000
Federal statutory income tax rate   34.00% 35.00% 34.00%
Valuation allowances against deferred tax assets   $ 2,469,000 $ 2,157,000  
Net deferred tax liability   28,821,000 7,000  
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere   3,400,000    
State net operating loss carryforwards   2,800,000    
Research and development tax credit carryforwards   490,000    
Total uncertain tax liability including interest and penalties   4,600,000 3,600,000  
Uncertain tax liability recorded as reduction to deferred tax assets   146,000 234,000  
Uncertain tax liability recorded to non-current liability   4,500,000 $ 3,400,000  
Approximate amount of uncertain tax liability to be recognized in 2018   817,000    
Approximate amount that would affect tax rate   $ 433,000    
Plan [Member]        
Federal statutory income tax rate 21.00%      
Research [Member]        
Tax credit carryforwards expiration date   Dec. 31, 2022    
Texas Tax Credit [Member]        
Other tax credit   $ 164,000    
Federal [Member]        
Operating loss carryforwards expiration date   Dec. 31, 2018    
State [Member]        
Operating loss carryforwards expiration date   Dec. 31, 2022    
Texas [Member] | State [Member]        
Tax credit carryforwards expiration date   Dec. 31, 2027