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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($) $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 25, 2019 | Apr. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Decrease in fair value of future net sales |  |  | $ 7.6 |
eNeura Inc [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Payments of restructured debt security | $ 4.0 |  |  |
Maximum borrowing capacity |  |  |  | $ 4.0
Other than temporary impairment losses | 6.5 |  |  |
Unrealized gains included in accumulated other comprehensive income | $ 5.2 |  |  |
Spinal Kinetics [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Milestone achievement period |  | 5 years | 12 months |
Contingent consideration |  |  | $ 35.1 |
Spinal Kinetics [Member] | Other Current Liabilities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration |  |  | 14.7 |
Spinal Kinetics [Member] | Other Long-term Liabilities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration |  |  | $ 20.4 |
Maximum [Member] | Spinal Kinetics [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Future milestone payments |  | $ 60.0 |  |
US Food And Drug Administration [Member] | Spinal Kinetics [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Future milestone payments |  | 15.0 |  |
Revenue Milestone [Member] | Spinal Kinetics [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Future milestone payments |  | $ 45.0 |  |

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562 + Details
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