Business acquisition conversion of shares into net cash subject to adjustments.

No definition available.

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- Definition

Future contingent milestone payments.

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- Definition

Milestone achievement period.

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- Definition

Date when the business acquisition agreement was executed, in CCYY-MM-DD format.

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No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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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

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

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- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Acquisition of Spinal Kinetics, Inc. - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Mar. 15, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Increase in the fair value of a contingent consideration		$ 1,580		$ 2,689
Goodwill		70,747	$ 70,747	70,747		$ 53,565
Spinal Kinetics [Member]
Business Acquisition [Line Items]
Business acquisition date	Apr. 30, 2018
Business acquisition conversion of shares into net cash subject to adjustments	$ 45,000
Business acquisition, percentage of outstanding stock					100.00%
Fair value of the consideration transferred	$ 76,055
Milestone achievement period	5 years
Contingent consideration	$ 25,491	28,200	28,200	28,200
Goodwill	17,182
Acquisition related costs		300		3,300
Revenue from acquisition		2,900		5,200
Net loss from Acquisition		$ 2,100		$ 3,500
Spinal Kinetics [Member] \| Spinal Implants [Member]
Business Acquisition [Line Items]
Goodwill	17,200
Spinal Kinetics [Member] \| Operating Expense [Member]
Business Acquisition [Line Items]
Increase in the fair value of a contingent consideration			$ 2,700
Spinal Kinetics [Member] \| US Food And Drug Administration [Member]
Business Acquisition [Line Items]
Future milestone payments	15,000
Spinal Kinetics [Member] \| Revenue Milestone [Member]
Business Acquisition [Line Items]
Future milestone payments	45,000
Spinal Kinetics [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Future milestone payments	$ 60,000