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Acquisition Of Ascyrus (Narrative) (Details) - USD ($)
12 Months Ended
Sep. 02, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Noncurrent portion of contingent consideration   $ 43,500,000    
Current portion of contingent consideration   16,430,000    
Goodwill   260,061,000 $ 186,697,000 $ 188,781,000
General, administrative, and marketing   141,136,000 $ 143,011,000 $ 140,574,000
Following FDA Approval For AMDS [Member]        
Business Acquisition [Line Items]        
Aggregate amount of consideration transferred   $ 120,000,000.0    
Ascyrus Medical LLC [Member]        
Business Acquisition [Line Items]        
Aggregate amount of consideration transferred $ 83,100,000      
Total consideration $ 138,543,000      
Equity ownership percent 100.00%      
Cash consideration $ 63,136,000      
Common shares issued 991,800      
Common stock value issued in business combination $ 20,000,000      
Period for weighted average closing price   10 days    
Goodwill 63,357,000 $ 63,400,000    
Transaction and integration costs   888,000    
General, administrative, and marketing   4,500,000    
Amount of goodwill deducted for tax purposes   $ 62,100,000    
Fair value of total consideration 138,543,000      
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member]        
Business Acquisition [Line Items]        
Cash consideration 60,000,000.0      
Common stock value issued in business combination 20,000,000.0      
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Aggregate amount of consideration transferred 200,000,000.0      
Ascyrus Medical LLC [Member] | FDA Approves Premarket Approval [Member]        
Business Acquisition [Line Items]        
Cash consideration 10,000,000.0      
Common stock value issued in business combination 10,000,000.0      
Ascyrus Medical LLC [Member] | FDA Approves Premarket Approval [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Aggregate amount of consideration transferred 200,000,000.0      
Ascyrus Medical LLC [Member] | AMDS Obtained In Japan [Member]        
Business Acquisition [Line Items]        
Cash consideration 25,000,000.0      
Ascyrus Medical LLC [Member] | AMDS Obtained In China [Member]        
Business Acquisition [Line Items]        
Cash consideration 10,000,000.0      
Ascyrus Medical LLC [Member] | If Japan Or China Obtains Approval [Member]        
Business Acquisition [Line Items]        
Cash consideration 10,000,000.0      
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member]        
Business Acquisition [Line Items]        
Cash consideration 55,000,000.0      
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Cash consideration 65,000,000.0      
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member] | Maximum [Member]        
Business Acquisition [Line Items]        
Cash consideration $ 75,000,000.0      
Ascyrus Medical LLC [Member] | Following FDA Approval For AMDS [Member]        
Business Acquisition [Line Items]        
Period of required contingent consideration 3 years