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Acquisition of Spinal Kinetics, Inc. - Additional Information (Detail) - USD ($) $ in Thousands		2 Months Ended	3 Months Ended	6 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2018	Mar. 15, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
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
Future milestone payments	60,000
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	26,600	26,600	26,600
Goodwill	17,182
Acquisition related costs			1,500	3,000
Reveneue from acquisition			2,300	2,300
Net loss from Acquisition			$ 1,800	$ 1,800
Spinal Kinetics [Member] | Spine Fixation [Member]
Business Acquisition [Line Items]
Goodwill	17,200
Spinal Kinetics [Member] | Other Expense [Member]
Business Acquisition [Line Items]
Increase in the fair value of a contingent consideration		$ 1,100
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

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