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Acquisitions - Narrative (Details) - USD ($) shares in Millions |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 04, 2016 | Jan. 20, 2016 | Dec. 04, 2015 | Jul. 14, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  | $ 482,000 | $ 500,000 | $ 495,000
Number of units acquired |  | 2.0 |  |  |  |  |
Percent owned |  |  |  |  | 15.49% |  |
Goodwill acquired |  |  |  |  | $ 2,555,000 |  |
Payments to acquire investment |  | $ 2,000,000 |  |  |  |  |
HeRO®Graft [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration paid | $ 18,500,000 |  |  |  |  |  |
Income since acquisition date |  |  |  |  |  |  | $ 1,300,000
Weighted average useful life | 9 years 9 months 26 days |  |  |  |  |  |
Quellent, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  | 500,000 |
Consideration paid |  |  |  | $ 1,000,000 |  |  |
Accrued purchase obligation |  |  |  |  |  | 500,000 |
Noncurrent contingent consideration |  |  |  |  |  | 270,000 |
Goodwill acquired |  |  |  |  |  | 60,000 |
License agreements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 17,023,000 | 16,671,000 |
Developed technology |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 79,168,000 | 69,861,000 |
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 |  |  |  |  |  | 1,210,000 |
Customer Lists |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 5,773,000 | 5,770,000 |
Customer Lists | HeRO®Graft [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Useful life | 12 years |  |  |  |  |  |
Trademarks |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible Assets |  |  |  |  | 5,272,000 | $ 4,705,000 |
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 |  |  |  |  | $ 500,000 |  |
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 |  |  | $ 1,000,000 |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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