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Business Combinations - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended	6 Months Ended
	May 02, 2018	Apr. 04, 2018	Jan. 16, 2018	Jun. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Contingent consideration				$ 178,449	$ 178,449	$ 33,973
Caisson Interventional LLC
Business Acquisition [Line Items]
Percentage of voting interests acquired	51.00%
Debt forgiveness	$ 6,300
Cash	18,000			14,400
Contingent consideration				39,600	39,600
ImThera Medical, Inc.
Business Acquisition [Line Items]
Percentage of voting interests acquired			86.00%
Fair value of consideration transferred			$ 216,656
Cash			78,332
Contingent consideration			112,744
Revenue				100	200
Operating loss				(2,600)	(3,600)
TandemLife
Business Acquisition [Line Items]
Fair value of consideration transferred		$ 243,861
Cash		203,671
Contingent consideration		50,000
Revenue				6,000	6,000
Operating loss				(6,100)	6,100
Upfront costs		204,000
SG&A | ImThera Medical, Inc.
Business Acquisition [Line Items]
Acquisition-related expense				200	300
SG&A | TandemLife
Business Acquisition [Line Items]
Acquisition-related expense				$ 1,600	$ 1,900
Maximum | Caisson Interventional LLC
Business Acquisition [Line Items]
Fair value of consideration transferred	$ 72,000
Maximum | ImThera Medical, Inc.
Business Acquisition [Line Items]
Fair value of consideration transferred			$ 225,000
Maximum | TandemLife
Business Acquisition [Line Items]
Fair value of consideration transferred		$ 250,000

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