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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 203,035	$ 171,069
United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	110,055	102,117
International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92,980	68,952
Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	195,855	164,754
Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	103,137	96,022
Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92,718	68,732
Stand-alone devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83,246	63,653
Stand-alone devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	44,010	36,164
Stand-alone devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39,236	27,489
Custom kits and procedure trays | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33,272	28,874
Custom kits and procedure trays | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,318	21,466
Custom kits and procedure trays | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,954	7,408
Inflation devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22,419	18,507
Inflation devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,668	7,975
Inflation devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	14,751	10,532
Catheters | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33,865	30,176
Catheters | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	15,270	15,129
Catheters | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	18,595	15,047
Embolization devices | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,587	12,527
Embolization devices | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,033	5,541
Embolization devices | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,554	6,986
CRM/EP | Cardiovascular
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	10,466	11,017
CRM/EP | Cardiovascular | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,838	9,747
CRM/EP | Cardiovascular | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,628	1,270
Endoscopy devices | Endoscopy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	7,180	6,315
Endoscopy devices | Endoscopy | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	6,918	6,095
Endoscopy devices | Endoscopy | International
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 262	$ 220

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