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Acquisitions and Strategic Investments - Narrative (Details) shares in Thousands, $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Jul. 06, 2016 USD ($) | Feb. 04, 2016 USD ($) | Jan. 20, 2016 USD ($) shares | Dec. 04, 2015 USD ($) | Jul. 14, 2015 USD ($) installment | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Mar. 31, 2015 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire investment |  |  | $ 2,000 |  |  |  | $ 500 |  |  |  |
Number of units acquired | shares |  |  | 2,000 |  |  |  | 500 |  |  |  |
Percent owned |  |  |  |  |  | 18.60% |  |  |  | 18.60% |
Payments to acquire intangible assets |  |  |  |  |  |  |  | $ 500 |  | $ 1,594 | $ 1,385
Accrued purchase obligation |  |  |  |  |  |  |  |  |  | 293 | $ 1,300
Goodwill acquired |  |  |  |  |  |  |  |  |  | 28,584 |
DFINE, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid | $ 97,500 |  |  |  |  |  |  |  |  |  |
Consideration paid related to net working capital adjustment | 578 |  |  |  |  |  |  |  |  |  |
Net sales related to acquisition |  |  |  |  |  | $ 7,000 |  |  |  | 7,000 |
Trade receivables acquired, gross | 4,300 |  |  |  |  |  |  |  |  |  |
Trade receivables, expected to be uncollectible | $ 224 |  |  |  |  |  |  |  |  |  |
Weighted average useful life | 14 years 9 months 21 days |  |  |  |  |  |  |  |  |  |
HeRO®Graft |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  | $ 18,500 |  |  |  |  |  |  |  |  |
Weighted average useful life |  | 9 years 9 months 26 days |  |  |  |  |  |  |  |  |
Income since acquisition date |  |  |  |  |  |  |  |  | $ 1,900 | 5,200 |
Quellent, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid |  |  |  |  | $ 1,000 |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  | 500 |  |  |
Number of installments | installment |  |  |  |  | 2 |  |  |  |  |  |
Accrued purchase obligation |  |  |  |  |  |  |  | 500 |  |  |
Noncurrent contingent consideration |  |  |  |  |  |  |  | 270 |  |  |
Goodwill acquired |  |  |  |  |  |  |  | 60 |  |  |
License agreements |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 17,335 |  | 16,671 |  | 17,335 |
Developed technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 139,613 |  | 69,861 |  | 139,613 |
Developed technology | DFINE, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life | 15 years |  |  |  |  |  |  |  |  |  |
Developed technology | HeRO®Graft |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 7,142 |  | 5,770 |  | 7,142 |
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 |  |  |  |  |  | 9,289 |  | 4,705 |  | 9,289 |
Trademarks | DFINE, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life | 15 years |  |  |  |  |  |  |  |  |  |
Trademarks | HeRO®Graft |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 5 years 6 months |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  |  |  | $ 1,250 |  |  |
Potential payments on license agreement |  |  |  | $ 250 |  |  |  |  |  |  |
Cardiovascular Segment | DFINE, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  | $ 1,600 |  |  |  | $ 1,600 |

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