Revenue Recognition and Accounts Receivable - Schedule of Net Sales by Major Product Category by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 110,985	$ 113,499	$ 288,943	$ 338,461
Change	(2.20%)		(14.60%)
Bone Growth Therapies [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 47,066	48,836	$ 120,888	146,228
Change	(3.60%)		(17.30%)
Spinal Implants [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 25,505	22,947	$ 67,025	69,076
Change	11.10%		(3.00%)
Biologics [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 15,245	16,308	$ 40,319	48,784
Change	(6.50%)		(17.40%)
Global Spine [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 87,816	88,091	$ 228,232	264,088
Change	(0.30%)		(13.60%)
Global Extremities [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Net sales	$ 23,169	$ 25,408	$ 60,711	$ 74,373
Change	(8.80%)		(18.40%)