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Acquisition of Spinal Kinetics, Inc. - Schedule of Acquisition Date Fair Value of Consideration Transferred (Detail) - Spinal Kinetics [Member] - USD ($) $ in Thousands | Apr. 30, 2018 | Sep. 30, 2018
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Fair value of consideration transferred |  |
Cash paid | $ 50,564 |
Contingent consideration | 25,491 | $ 28,200
Total fair value of consideration transferred | $ 76,055 |

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