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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective income tax rate 41.00% 32.00% 16.00%
Reversal in uncertain tax positions $ (153,000) $ (869,000) $ (781,000)
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations $ 227,000 $ 904,000 $ 490,000
Federal statutory income tax rate 35.00% 34.00% 34.00%
Valuation allowances against deferred tax assets $ 2,157,000 $ 2,109,000  
Net deferred tax liability 7,000    
Net deferred tax asset   18,188,000  
Federal net operating loss carryforwards related to the acquisitions of Cardiogenesis and Hemosphere 6,300,000    
State net operating loss carryforwards 2,400,000    
Research and development tax credit carryforwards 702,000    
Total uncertain tax liability including interest and penalties 3,600,000 1,200,000  
Uncertain tax liability recorded as reduction to deferred tax assets 234,000 104,000  
Uncertain tax liability recorded to non-current liability 3,400,000 $ 1,100,000  
Approximate amount of uncertain tax liability to be recognized in 2017 $ 235,000    
Research [Member]      
Tax credit carryforwards expiration date Dec. 31, 2022    
Texas Tax Credit [Member]      
Other tax credit $ 150,000    
Federal [Member]      
Operating loss carryforwards expiration date Dec. 31, 2017    
State [Member]      
Operating loss carryforwards expiration date Jan. 01, 2016    
Texas [Member] | State [Member]      
Tax credit carryforwards expiration date Dec. 31, 2027