Acquisition of Spinal Kinetics, Inc. - Schedule of Fair Value of Consideration Transferred (Detail) - Spinal Kinetics [Member] - USD ($) $ in Thousands		8 Months Ended	12 Months Ended
Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2018
Fair value of consideration transferred
Cash paid	$ 50,564		$ 51,109
Contingent consideration	25,491	$ 25,491	25,491
Total fair value of consideration transferred	$ 76,055		$ 76,600
Cash paid, Adjustments		545
Total fair value of consideration transferred, Adjustments		$ 545

Business combination, adjustment, cash.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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- Definition

The amount, measured at acquisition-date fair value, of all liabilities assumed that arise from contingencies and were recognized by the entity.

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- Definition

This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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