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Fair Value Measurements and Investments - Schedule of Reconciliation For Contingent Consideration Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value, Inputs, Level 3 [Member] - Spinal Kinetics [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Spinal Kinetics contingent consideration at January 1 | $ 42,700 | $ 28,560
Increase (decrease) in fair value recognized in acquisition-related amortization and remeasurement | (7,300) | 29,140
Payment made |  | (15,000)
Spinal Kinetics contingent consideration at December 31 | $ 35,400 | $ 42,700

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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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