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Fair Value Measurements and Investments - Schedule of Valuation Methodology and Unobservable Inputs for Level 3 Assets and Liabilities Measured at Fair Value (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Spinal Kinetics [Member] | Revenue Discount Rate |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Consideration transferred | $ 36,900 |
Spinal Kinetics [Member] | Revenue Discount Rate | Minimum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement input | 7.41 |
Spinal Kinetics [Member] | Revenue Discount Rate | Maximum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement input | 7.49 |
Spinal Kinetics [Member] | Payment Discount Rate | Minimum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement input | 4.33 |
Spinal Kinetics [Member] | Payment Discount Rate | Maximum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement input | 4.40 |
Spinal Kinetics [Member] | Projected Year of Payment | Minimum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement period | 2021 |
Spinal Kinetics [Member] | Projected Year of Payment | Maximum [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Business combination contingent consideration liability measurement period | 2022 |
Spinal Kinetics [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Spinal Kinetics contingent consideration estimated fair value at January 1 | $ 35,400 | $ 42,700
Increase (decrease) in fair value recognized in acquisition-related amortization and remeasurement | 1,500 | (9,000)
Spinal Kinetics contingent consideration estimated fair value at March 31 | 36,900 | $ 33,700
Neo Medical [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Neo Medical Convertible Loan | $ 6,200 |
Fair value implied volatility | 21.90% |
Fair value discount rate | 92.70% |

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