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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 8 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2017 | Aug. 04, 2017 | Jul. 03, 2017 | May 01, 2017 | Jan. 31, 2017 | Jul. 06, 2016 | Feb. 04, 2016 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 211,927 | $ 238,147 | $ 238,147 | $ 238,147 | $ 211,927 | $ 184,472
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  | 11,039 | $ 0 | $ 0
ITL Healthcare Pty Ltd |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | $ 1,287 |  |  |  |  |  |  |  |  |  |  |  |
Other receivables | 56 |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 1,808 |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets | 65 |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment | 1,053 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 3,740 |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired | 13,949 |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables | (216) |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | (542) |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities - current | (1,901) |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed | (2,659) |  |  |  |  |  |  |  |  |  |  |  |
Total net assets acquired | 11,290 |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | 11,300 |  |  |  |  |  |  |  |  |  |  |  |
ITL Healthcare Pty Ltd | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles | $ 5,940 |  |  |  |  |  |  |  |  |  |  |  |
Laurane Medical S.A.S. |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  | $ 594 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 6,366 |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  | 22,000 |  |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  | 16,500 |  |  |  |  |  |  |  |  |  |  |
Laurane Medical S.A.S. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | 14,920 |  |  |  |  |  |  |  |  |  |  |
Laurane Medical S.A.S. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | $ 120 |  |  |  |  |  |  |  |  |  |  |
Osseon LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  | $ 979 |  |  |  |  |  |  |  |  |  |
Property and equipment |  |  | 58 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 203 |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | 6,840 |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  | 6,800 |  |  |  |  |  |  |  |  |  |
Osseon LLC | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  | 5,400 |  |  |  |  |  |  |  |  |  |
Osseon LLC | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  | $ 200 |  |  |  |  |  |  |  |  |  |
Vascular Access Technologies, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 4,323 |  |  |  |  | 4,281 | 4,281 | 4,281 |  |
Total assets acquired |  |  |  | 9,900 |  |  |  |  | 9,900 | 9,900 | 9,900 |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities - current |  |  |  | (3,073) |  |  |  |  | (3,101) | (3,101) | (3,101) |  |
Total purchase price |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | (42) |  |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  |  | (28) |  |  |  |
Total net assets acquired |  |  |  |  |  |  |  |  | 0 |  |  |  |
Vascular Access Technologies, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  | 7,800 |  |  |  |  | 7,800 | 7,800 | 7,800 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  | 0 |  |  |  |
Vascular Access Technologies, Inc. | In Process Research and Development |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  | $ 850 |  |  |  |  | 920 | 920 | 920 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  | 70 |  |  |  |
Argon Medical Devices, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  | $ 1,436 |  |  |  | 1,436 | 1,436 | 1,436 |  |
Trade receivables |  |  |  |  | 8,351 |  |  |  | 8,351 | 8,351 | 8,351 |  |
Inventories |  |  |  |  | 12,217 |  |  |  | 11,222 | 11,222 | 11,222 |  |
Prepaid expenses and other assets |  |  |  |  | 1,275 |  |  |  | 1,275 | 1,275 | 1,275 |  |
Income tax refund receivable |  |  |  |  | 0 |  |  |  | 165 | 165 | 165 |  |
Property and equipment |  |  |  |  | 2,667 |  |  |  | 2,319 | 2,319 | 2,319 |  |
Deferred tax assets |  |  |  |  | 184 |  |  |  | 202 | 202 | 202 |  |
Total assets acquired |  |  |  |  | 31,530 |  |  |  | 29,570 | 29,570 | 29,570 |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  | (2,306) |  |  |  | (2,414) | (2,414) | (2,414) |  |
Accrued expenses |  |  |  |  | (5,083) |  |  |  | (5,083) | (5,083) | (5,083) |  |
Income taxes payable |  |  |  |  | 2 |  |  |  | 0 | 0 | 0 |  |
Deferred income tax liabilities |  |  |  |  | (999) |  |  |  | (934) | (934) | (934) |  |
Total liabilities assumed |  |  |  |  | (8,390) |  |  |  | (8,431) | (8,431) | (8,431) |  |
Total net assets acquired |  |  |  |  | 23,140 |  |  |  | 21,139 | 21,139 | 21,139 |  |
Gain on bargain purchase |  |  |  |  | 12,243 |  |  |  |  |  | 11,039 |  |
Total purchase price |  |  |  |  | 10,897 |  |  |  |  |  | 10,100 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  | 0 |  |  |
Trade receivables |  |  |  |  |  |  |  |  |  | 0 |  |  |
Inventories |  |  |  |  |  |  |  |  |  | (995) |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  | 0 |  |  |
Income tax refund receivable |  |  |  |  |  |  |  |  |  | 165 |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  | (348) |  |  |
Deferred tax assets |  |  |  |  |  |  |  |  |  | 18 |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  | (1,960) |  |  |
Trade payables |  |  |  |  |  |  |  |  |  | (108) |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  | 0 |  |  |
Income taxes payable |  |  |  |  |  |  |  |  |  | 2 |  |  |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  | 65 |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  | (41) |  |  |
Total net assets acquired |  |  |  |  |  |  |  |  |  | (2,001) |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  | 1,204 |  |  |
Total purchase price |  |  |  |  | (797) |  |  |  |  | (797) |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Negative Adjustment, Amount |  |  |  |  |  |  |  |  |  |  | 1,200 |  |
Argon Medical Devices, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | 2,600 |  |  |  | 2,200 | 2,200 | 2,200 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | (400) |  |  |
Argon Medical Devices, Inc. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | 1,300 |  |  |  | 1,500 | 1,500 | 1,500 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | 200 |  |  |
Argon Medical Devices, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | 1,500 |  |  |  | 900 | 900 | 900 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | (600) |  |  |
Catheter Connections, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | 952 |  |  |  | 958 | 958 | 958 |  |
Inventories |  |  |  |  | 2,244 |  |  |  | 2,157 | 2,157 | 2,157 |  |
Prepaid expenses and other assets |  |  |  |  | 181 |  |  |  | 85 | 85 | 85 |  |
Property and equipment |  |  |  |  | 1,472 |  |  |  | 1,472 | 1,472 | 1,472 |  |
Goodwill |  |  |  |  | 7,612 |  |  |  | 8,989 | 8,989 | 8,989 |  |
Total assets acquired |  |  |  |  | 38,361 |  |  |  | 38,361 | 38,361 | 38,361 |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  | (338) |  |  |  | (338) | (338) | (338) |  |
Accrued expenses |  |  |  |  | (23) |  |  |  | (23) | (23) | (23) |  |
Total liabilities assumed |  |  |  |  | (361) |  |  |  | (361) | (361) | (361) |  |
Total net assets acquired |  |  |  |  | 38,000 |  |  |  | 38,000 | 38,000 | 38,000 |  |
Total purchase price |  |  |  |  | 38,000 |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  |  |  |  | 6 |  |  |
Inventories |  |  |  |  |  |  |  |  |  | (87) |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  | (96) |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  | 0 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 1,377 |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  | 0 |  |  |
Trade payables |  |  |  |  |  |  |  |  |  | 0 |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  | 0 |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  | 0 |  |  |
Total net assets acquired |  |  |  |  |  |  |  |  |  | 0 |  |  |
Catheter Connections, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | 22,900 |  |  |  | 21,100 | 21,100 | 21,100 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | (1,800) |  |  |
Catheter Connections, Inc. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | 100 |  |  |  | 700 | 700 | 700 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | 600 |  |  |
Catheter Connections, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  | $ 2,900 |  |  |  | $ 2,900 | 2,900 | 2,900 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
DFINE, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  | $ 4,054 |  |  |  |  |  |  |
Other receivables |  |  |  |  |  | 6 |  |  |  |  |  |  |
Inventories |  |  |  |  |  | 8,585 |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  | 630 |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  | 1,630 |  |  |  |  |  |  |
Other long-term assets |  |  |  |  |  | 145 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 24,818 |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  | 114,268 |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  |  | (1,790) |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  | (5,298) |  |  |  |  |  |  |
Deferred income tax liabilities - current |  |  |  |  |  | (701) |  |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  | (10,844) |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  | (18,633) |  |  |  |  |  |  |
Total net assets acquired |  |  |  |  |  | 95,635 |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | 97,500 |  |  |  |  |  |  |
Cash received |  |  |  |  |  |  |  |  |  |  | $ 1,327 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  | 89 |  |  |  |  |
Property and equipment |  |  |  |  |  |  |  | 109 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 1,200 |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  | 113 |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |
DFINE, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 67,600 |  |  |  |  |  |  |
DFINE, Inc. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 2,400 |  |  |  |  |  |  |
DFINE, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | $ 4,400 |  |  |  |  |  |  |
HeRO®Graft |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  | $ 2,455 |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  | 290 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 2,555 |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  | 18,500 |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  | 18,500 |  |  |  |  |  |
HeRO®Graft | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 12,100 |  |  |  |  |  |
HeRO®Graft | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 400 |  |  |  |  |  |
HeRO®Graft | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | $ 700 |  |  |  |  |  |

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