Acquisitions - Narrative (Details) - USD ($)				3 Months Ended			12 Months Ended
	Jan. 31, 2017	Jul. 06, 2016	Feb. 04, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Payments to acquire intangible assets				$ 668,000		$ 482,000
Goodwill acquired				7,612,000
Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Total purchase price	$ 10,897,000
Net sales related to acquisition				7,200,000
Weighted average useful life	5 years 11 months 15 days
Catheter Connections, Inc.
Business Acquisition [Line Items]
Total purchase price	$ 38,000,000
Net sales related to acquisition				1,800,000
Weighted average useful life	11 years 10 months
DFINE, Inc.
Business Acquisition [Line Items]
Total purchase price		$ 97,500,000
Net sales related to acquisition							$ 13,500,000
Trade receivables acquired, gross		4,300,000
Trade receivables, expected to be uncollectible		$ (224,000)
Weighted average useful life		14 years 10 months
Consideration paid related to net working capital adjustment		$ 578,000
Reduction of purchase price					$ 1,100,000
Measurement period adjustment, reduction in inventories					89,000
Measurement period adjustment, reduction in property and equipment					109,000
Measurement period adjustment, reduction in goodwill					1,200,000
Measurement period adjustment, reduction in accrued expenses					407,000
Measurement period adjustment, increase in deferred tax liabilities					(113,000)
HeRO®Graft
Business Acquisition [Line Items]
Total purchase price			$ 18,500,000
Weighted average useful life			9 years 9 months 25 days
Income since acquisition date				7,100,000
Developed technology
Business Acquisition [Line Items]
Intangible Assets				156,414,000	$ 135,358,000		135,358,000
Developed technology | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life	7 years
Developed technology | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life	12 years
Developed technology | DFINE, Inc.
Business Acquisition [Line Items]
Useful life		15 years
Developed technology | HeRO®Graft
Business Acquisition [Line Items]
Useful life			10 years
Customer Lists
Business Acquisition [Line Items]
Intangible Assets				7,616,000		6,860,000
Customer Lists | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life	5 years
Customer Lists | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life	8 years
Customer Lists | DFINE, Inc.
Business Acquisition [Line Items]
Useful life		9 years
Customer Lists | HeRO®Graft
Business Acquisition [Line Items]
Useful life			12 years
Trademarks
Business Acquisition [Line Items]
Intangible Assets				13,128,000		$ 9,050,000
Trademarks | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Useful life	5 years
Trademarks | Catheter Connections, Inc.
Business Acquisition [Line Items]
Useful life	10 years
Trademarks | DFINE, Inc.
Business Acquisition [Line Items]
Useful life		15 years
Trademarks | HeRO®Graft
Business Acquisition [Line Items]
Useful life			5 years 6 months
Cardiovascular Segment | Argon Medical Devices, Inc.
Business Acquisition [Line Items]
Acquisition-related costs				$ 1,100,000
Cardiovascular Segment | DFINE, Inc.
Business Acquisition [Line Items]
Acquisition-related costs							$ 1,600,000