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Acquisitions - Narrative (Details) - USD ($) |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
May 02, 2018 | May 02, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Escrow deposit - Caisson |  |  | $ 1,000,000 | $ 0
Caisson Interventional LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interest acquired |  | 51.00% |  |
Purchase price |  | $ 72,000,000 |  |
Debt forgiven |  | 6,309,000 |  |
Cash paid |  | 18,000,000 |  |
Contingent consideration |  | 39,600,000 |  |
Acquired goodwill to be deductible for tax purposes |  | 9,600,000 |  |
Escrow deposit - Caisson |  | $ 3,000,000 |  |
Revenue |  |  | 0 |
Expenses |  |  | 16,900,000 |
Caisson Interventional LLC | Prepaid Expenses and Other Current Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Escrow deposit - Caisson |  |  | 2,000,000 |
Caisson Interventional LLC | Other Noncurrent Assets |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Escrow deposit - Caisson |  |  | 1,000,000 |
Caisson Interventional LLC | Scenario, Forecast |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid | $ 14,400,000 |  |  |
Selling, General and Administrative Expenses [Member] | Caisson Interventional LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition-related expense |  |  | $ 1,000,000 |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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