Acquisition Of Ascyrus (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Sep. 02, 2020	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Current portion of contingent consideration		$ 17,600	$ 17,600	$ 16,430
Noncurrent portion of contingent consideration		47,300	47,300	43,500
Goodwill		252,441	252,441	260,061
Cash distribution from escrow			777
Following FDA Approval For AMDS [Member]
Business Acquisition [Line Items]
Aggregate amount of consideration transferred			120,000
Ascyrus Medical LLC [Member]
Business Acquisition [Line Items]
Aggregate amount of consideration transferred	$ 82,400
Total consideration		137,766	137,766
Equity ownership percent	100.00%
Cash consideration	$ 62,400
Common shares issued	991,800
Common stock value issued in business combination	$ 20,000
Period for weighted average closing price	10 days
Current portion of contingent consideration		17,600	17,600	16,400
Noncurrent portion of contingent consideration		47,300	47,300	$ 43,500
Goodwill		62,416	62,416
Fair value of combined purchase consideration	$ 137,800
Contingent consideration, fair value adjustment		700	5,000
Fair value of total consideration		$ 137,766	$ 137,766
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member]
Business Acquisition [Line Items]
Cash consideration	60,000
Common stock value issued in business combination	20,000
Ascyrus Medical LLC [Member] | FDA Approval IDE for AMDS [Member] | Maximum [Member]
Business Acquisition [Line Items]
Aggregate amount of consideration transferred	200,000
Ascyrus Medical LLC [Member] | FDA Approves Premarket Approval [Member]
Business Acquisition [Line Items]
Cash consideration	10,000
Common stock value issued in business combination	10,000
Ascyrus Medical LLC [Member] | AMDS Obtained In Japan [Member]
Business Acquisition [Line Items]
Cash consideration	25,000
Ascyrus Medical LLC [Member] | AMDS Obtained In China [Member]
Business Acquisition [Line Items]
Cash consideration	10,000
Ascyrus Medical LLC [Member] | If Japan Or China Obtains Approval [Member]
Business Acquisition [Line Items]
Cash consideration	10,000
Ascyrus Medical LLC [Member] | Additional Potential Cash Payment If Japan Or China Obtains Approval [Member]
Business Acquisition [Line Items]
Cash consideration	55,000
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
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
Ascyrus Medical LLC [Member] | Following FDA Approval For AMDS [Member]
Business Acquisition [Line Items]
Period of required contingent consideration	3 years