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Revenue recognition and accounts receivable (Tables)

6 Months Ended

Jun. 30, 2019

Revenue Recognition And Accounts Receivable [Abstract]

Schedule of Net Sales by Major Product Category by Reporting Segment

The tables below present net sales by major product category by reporting segment:

	Three Months Ended June 30,
(U.S. Dollars, in thousands)	2019		2018		Change
Bone Growth Therapies	$	50,109	$	48,211		3.9	%
Spinal Implants		23,226		23,880		-2.7	%
Biologics		16,744		14,668		14.2	%
Global Spine		90,079		86,759		3.8	%
Global Extremities		25,771		24,788		4.0	%
Net sales	$	115,850	$	111,547		3.9	%

	Six Months Ended June 30,
(U.S. Dollars, in thousands)	2019		2018		Change
Bone Growth Therapies	$	97,392	$	94,374		3.2	%
Spinal Implants		46,129		44,587		3.5	%
Biologics		32,476		29,003		12.0	%
Global Spine		175,997		167,964		4.8	%
Global Extremities		48,965		52,292		-6.4	%
Net sales	$	224,962	$	220,256		2.1	%

Schedule of Net Sales

The table below presents net sales, which includes product sales and marketing service fees, for the three and six months ended June 30, 2019 and 2018.

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2019		2018		2019		2018
Product sales	$	99,865	$	97,453	$	193,799	$	192,342
Marketing service fees		15,985		14,094		31,163		27,914
Net sales	$	115,850	$	111,547	$	224,962	$	220,256