Acquisitions and Strategic Investments - Narrative (Details) shares in Thousands, $ in Thousands					3 Months Ended				6 Months Ended
	Feb. 04, 2016 USD ($)	Jan. 20, 2016 USD ($) shares	Dec. 04, 2015 USD ($)	Jul. 14, 2015 USD ($) installment	Jun. 30, 2016 USD ($) shares	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($)
Business Acquisition [Line Items]
Payments to acquire intangible assets							$ 500		$ 989	$ 875
Number of units acquired | shares		2,000			500				500
Percent owned					18.64%				18.64%
Accrued purchase obligation									$ 0	$ 1,500
Goodwill acquired									2,555
Payments to acquire investment		$ 2,000			$ 500
HeRO®Graft [Member]
Business Acquisition [Line Items]
Consideration paid	$ 18,500
Income since acquisition date								$ 2,100	3,400
Weighted average useful life	9 years 9 months 26 days
Quellent, LLC
Business Acquisition [Line Items]
Payments to acquire intangible assets							500
Consideration paid				$ 1,000
Number of installments | installment				2
Accrued purchase obligation							500
Noncurrent contingent consideration							270
Goodwill acquired							60
License agreements
Business Acquisition [Line Items]
Intangible Assets					17,404		16,671		17,404
Developed technology
Business Acquisition [Line Items]
Intangible Assets					76,111		69,861		76,111
Developed technology | HeRO®Graft [Member]
Business Acquisition [Line Items]
Useful life	10 years
Developed technology | Quellent, LLC
Business Acquisition [Line Items]
Useful life				13 years
Intangible Assets							1,210
Customer Lists
Business Acquisition [Line Items]
Intangible Assets					5,381		5,770		5,381
Customer Lists | HeRO®Graft [Member]
Business Acquisition [Line Items]
Useful life	12 years
Trademarks
Business Acquisition [Line Items]
Intangible Assets					5,113		$ 4,705		$ 5,113
Trademarks | HeRO®Graft [Member]
Business Acquisition [Line Items]
Useful life	5 years 6 months
ArraVasc Limited
Business Acquisition [Line Items]
Payments to acquire intangible assets					$ 500	$ 500
ArraVasc Limited | License agreements
Business Acquisition [Line Items]
Useful life			12 years
ArraVasc Limited | Additional Payments for License Agreement Milestone | License agreements
Business Acquisition [Line Items]
Potential payments on license agreement			$ 500