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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($) | Oct. 01, 2020 | Apr. 30, 2018 | Mar. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Future milestone payments |  |  | $ 30,000.0
Spinal Kinetics [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Milestone achievement period |  | 5 years |
Consideration transferred |  |  | 36,900,000
Spinal Kinetics [Member] | Other Current Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Consideration transferred |  |  | 15,000,000.0
Spinal Kinetics [Member] | Other Long-term Liabilities [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Consideration transferred |  |  | 21,900,000
Maximum [Member] | Spinal Kinetics [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Future milestone payments |  | $ 60,000,000.0 |
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 |  | 15,000,000.0 |
Revenue Milestone [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Future milestone payments |  |  | 15,000.0
Revenue Milestone [Member] | Spinal Kinetics [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Future milestone payments |  | $ 45,000,000.0 |
Neo Medical [Member] |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Convertible loans | $ 4,600,000 |  |
Convertible loans interest rate | 8.00% |  |
Maturity date | Oct. 01, 2024 |  |
Carrying value of investment |  |  | 5,000,000.0
Convertible loan credit losses |  |  | $ 0
Neo Medical [Member] | Preferred Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Amount of Preferred stock consideration | $ 5,000,000.0 |  |

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