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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  |  | 3 Months Ended | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 23, 2018 | Feb. 14, 2018 | Oct. 02, 2017 | Aug. 04, 2017 | Jul. 03, 2017 | May 01, 2017 | Jan. 31, 2017 | Jul. 06, 2016 | Feb. 04, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 248,998 |  |  | $ 248,998 | $ 248,998 |  | $ 238,147
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  | 0 | $ 669 |  |  | 0 | $ (11,574) |
DirectACCESS Medical, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories | $ 971 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 938 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired | 7,269 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price | 7,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DirectACCESS Medical, LLC | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles | 4,840 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DirectACCESS Medical, LLC | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles | 120 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DirectACCESS Medical, LLC | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Becton, Dickinson and Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  | $ 6,039 |  |  |  |  |  |  |  | 5,804 |  |  | 5,804 | 5,804 |  |
Property and equipment |  | 581 |  |  |  |  |  |  |  | 748 |  |  | 748 | 748 |  |
Goodwill |  | 5,387 |  |  |  |  |  |  |  | 10,613 |  |  | 10,613 | 10,613 |  |
Total assets acquired |  | 100,107 |  |  |  |  |  |  |  | 100,265 |  |  | 100,265 | 100,265 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  | (235) |  |  |
Property and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 167 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 5,226 |  |  |
Total net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  | 158 |  |  |
Total purchase price |  | 100,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Becton, Dickinson and Company | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | 79,900 |  |  |  |  |  |  |  | 74,000 |  |  | 74,000 | 74,000 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | (5,900) |  |  |
Becton, Dickinson and Company | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | 3,500 |  |  |  |  |  |  |  | 4,200 |  |  | 4,200 | 4,200 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 700 |  |  |
Becton, Dickinson and Company | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  | $ 4,700 |  |  |  |  |  |  |  | $ 4,900 |  |  | 4,900 | $ 4,900 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |
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 |  |  | 3,945 |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | 14,154 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  | (216) |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses |  |  | (747) |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  | (1,901) |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  | (2,864) |  |  |  |  |  |  |  |  |  |  |  |  |
Total net assets acquired |  |  | 11,290 |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | $ 4,281 |  |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  |  | (3,101) |  |  |  |  |  |  |  |  |  |
Total net assets acquired |  |  |  |  |  | 9,900 |  |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |  |
Vascular Access Technologies, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | 7,800 |  |  |  |  |  |  |  |  |  |
Vascular Access Technologies, Inc. | In-process technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  | $ 920 |  |  |  |  |  |  |  |  |  |
Argon Medical Devices, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 1,436 |  |  |  | 1,436 |
Trade receivables |  |  |  |  |  |  |  |  |  |  | 8,351 |  |  |  | 8,351 |
Inventories |  |  |  |  |  |  |  |  |  |  | 11,222 |  |  |  | 11,222 |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  | 1,275 |  |  |  | 1,275 |
Income tax refund receivables |  |  |  |  |  |  |  |  |  |  | 165 |  |  |  | 165 |
Property and equipment |  |  |  |  |  |  |  |  |  |  | 2,319 |  |  |  | 2,319 |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |  | 202 |  |  |  | 202 |
Total assets acquired |  |  |  |  |  |  |  |  |  |  | 29,570 |  |  |  | 29,570 |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  |  |  |  |  |  |  | (2,414) |  |  |  | (2,414) |
Accrued expenses |  |  |  |  |  |  |  |  |  |  | (5,083) |  |  |  | (5,083) |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  | (934) |  |  |  | (934) |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  | (8,431) |  |  |  | (8,431) |
Total net assets acquired |  |  |  |  |  |  |  |  |  |  | 21,139 |  |  |  | 21,139 |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net assets acquired |  |  |  |  |  |  | $ (797) |  |  |  |  |  |  |  |  |
Gain on bargain purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,039) |
Total purchase price |  |  |  |  |  |  | 10,900 |  |  |  |  |  |  |  | 10,100 |
Negative adjustment (Argon Medical Devices, Inc.) |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |
Argon Medical Devices, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  | 2,200 |  |  |  | 2,200 |
Argon Medical Devices, Inc. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  | 1,500 |  |  |  | 1,500 |
Argon Medical Devices, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  |  |  |  |  | $ 900 |  |  |  | $ 900 |
Catheter Connections, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  |  |  | 958 |  |  |  |  |  |  |  |  |
Inventories |  |  |  |  |  |  | 2,157 |  |  |  |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  | 85 |  |  |  |  |  |  |  |  |
Property and equipment |  |  |  |  |  |  | 1,472 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 8,989 |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  | 38,361 |  |  |  |  |  |  |  |  |
Liabilities Assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade payables |  |  |  |  |  |  | (338) |  |  |  |  |  |  |  |  |
Accrued expenses |  |  |  |  |  |  | (23) |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  | (361) |  |  |  |  |  |  |  |  |
Total net assets acquired |  |  |  |  |  |  | 38,000 |  |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  | 38,000 |  |  |  |  |  |  |  |  |
Catheter Connections, Inc. | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 21,100 |  |  |  |  |  |  |  |  |
Catheter Connections, Inc. | Customer lists |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | 700 |  |  |  |  |  |  |  |  |
Catheter Connections, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles |  |  |  |  |  |  | $ 2,900 |  |  |  |  |  |  |  |  |
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 - noncurrent |  |  |  |  |  |  |  | (10,844) |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  | (18,633) |  |  |  |  |  |  |  |
Total net assets acquired |  |  |  |  |  |  |  | 95,635 |  |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase price |  |  |  |  |  |  |  | 97,500 |  |  |  |  |  |  |  |
Cash received |  |  |  |  |  |  |  | 1,327 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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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