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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 | 9 Months Ended
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Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Spinal Kinetics [Member] | Revenue Discount Rate |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Consideration transferred | $ 18,400 |
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 | 6.5 |
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 | 6.7 |
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 | 3.9 |
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 | 4.0 |
Spinal Kinetics [Member] | Projected Year of Achievement |  |
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
Decrease in fair value recognized in acquisition-related amortization and remeasurement | (2,000) | (7,600)
Payment made | (15,000) |
Spinal Kinetics contingent consideration estimated fair value at September 30 | 18,400 | $ 35,100
Neo Medical [Member] |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Neo Medical Convertible Loan | $ 7,080 |
Fair value implied volatility | 21.60% |
Fair value discount rate | 90.40% |

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