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Business Combinations - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 02, 2018 | Apr. 04, 2018 | Jan. 16, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration |  |  |  | $ 178,449 | $ 178,449 | $ 33,973
Caisson Interventional LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired | 51.00% |  |  |  |  |
Debt forgiveness | $ 6,300 |  |  |  |  |
Cash | 18,000 |  |  | 14,400 |  |
Contingent consideration |  |  |  | 39,600 | 39,600 |
ImThera Medical, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 86.00% |  |  |
Fair value of consideration transferred |  |  | $ 216,656 |  |  |
Cash |  |  | 78,332 |  |  |
Contingent consideration |  |  | 112,744 |  |  |
Revenue |  |  |  | 100 | 200 |
Operating loss |  |  |  | (2,600) | (3,600) |
TandemLife |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of consideration transferred |  | $ 243,861 |  |  |  |
Cash |  | 203,671 |  |  |  |
Contingent consideration |  | 50,000 |  |  |  |
Revenue |  |  |  | 6,000 | 6,000 |
Operating loss |  |  |  | (6,100) | 6,100 |
Upfront costs |  | 204,000 |  |  |  |
SG&A | ImThera Medical, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related expense |  |  |  | 200 | 300 |
SG&A | TandemLife |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related expense |  |  |  | $ 1,600 | $ 1,900 |
Maximum | Caisson Interventional LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of consideration transferred | $ 72,000 |  |  |  |  |
Maximum | ImThera Medical, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of consideration transferred |  |  | $ 225,000 |  |  |
Maximum | TandemLife |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Fair value of consideration transferred |  | $ 250,000 |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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