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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Oct. 25, 2019 | Apr. 30, 2018 | Jun. 30, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Decrease in fair value of future net sales |  |  | $ 6.9
eNeura Inc [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Payments of restructured debt security | $ 4.0 |  |
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 |  |  | $ 35.8
Spinal Kinetics [Member] | Other Current Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Contingent consideration |  |  | 14.5
Spinal Kinetics [Member] | Other Long-term Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Contingent consideration |  |  | $ 21.3
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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