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Acquisitions and Strategic Investments - Narrative (Details) shares in Thousands, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended
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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 |  |  |  |  |  |  |

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