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Revenue recognition and accounts receivable (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(U.S. Dollars, in thousands)		2019				2018				Change
Bone Growth Therapies		$	47,283			$	46,163				2.4	%
Spinal Implants			22,903				20,707				10.6	%
Biologics			15,732				14,335				9.7	%
Global Spine			85,918				81,205				5.8	%
Global Extremities			23,194				27,504				-15.7	%
Net sales		$	109,112			$	108,709				0.4	%

Schedule of Net Sales

The table below presents net sales, which includes product sales and marketing service fees, for the three months ended March 31, 2019 and 2018.

		Three Months Ended March 31,
(U.S. Dollars, in thousands)		2019				2018
Product sales		$	93,934			$	94,889
Marketing service fees			15,178				13,820
Net sales		$	109,112			$	108,709