Revenue recognition and accounts receivable (Tables)

6 Months Ended

Jun. 30, 2021

Revenue Recognition And Accounts Receivable [Abstract]

Schedule of Net Sales by Major Product Category by Reporting Segment

The table below presents net sales by major product category by reporting segment:

	Three Months Ended June 30,
(U.S. Dollars, in thousands)	2021		2020		Change
Bone Growth Therapies	$	49,706	$	28,379		75.2	%
Spinal Implants		30,092		18,594		61.8	%
Biologics		14,852		11,125		33.5	%
Global Spine		94,650		58,098		62.9	%
Global Orthopedics		26,744		15,037		77.9	%
Net sales	$	121,394	$	73,135		66.0	%

	Six Months Ended June 30,
(U.S. Dollars, in thousands)	2021		2020		Change
Bone Growth Therapies	$	92,653	$	73,822		25.5	%
Spinal Implants		55,793		41,520		34.4	%
Biologics		28,544		25,074		13.8	%
Global Spine		176,990		140,416		26.0	%
Global Orthopedics		49,997		37,542		33.2	%
Net sales	$	226,987	$	177,958		27.6	%

Schedule of Components Net Sales

The table below presents product sales and marketing service fees, which are both components of net sales:

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2021		2020		2021		2020
Product sales	$	106,947	$	62,435	$	199,210	$	153,856
Marketing service fees		14,447		10,700		27,777		24,102
Net sales	$	121,394	$	73,135	$	226,987	$	177,958

Allowances for Expected Credit Losses

The following table provides a detail of changes in the Company’s allowance for expected credit losses for the three and six months ended June 30, 2021 and 2020:

(U.S. Dollars, in thousands)	Three Months Ended June 30,						Six Months Ended June 30,
	2021			2020			2021			2020
Allowance for expected credit losses beginning balance	$	4,506		$	5,591		$	4,848		$	3,987
Impact of adoption of ASU 2016-13		—			—			—			1,120
Current period provision (recovery) for expected credit losses		(32	)		885			(214	)		1,564
Writeoffs charged against the allowance and other		(34	)		(224	)		(80	)		(338	)
Effect of changes in foreign exchange rates		31			112			(83	)		31
Allowance for expected credit losses ending balance	$	4,471		$	6,364		$	4,471		$	6,364

Schedule of Changes in Contract Liability

(U.S. Dollars, in thousands)	Three Months Ended June 30,					Six Months Ended June 30,
	2021			2020		2021			2020
Contract liability beginning balance	$	13,851		$	—	$	13,851		$	—
Additions		—			13,851		—			13,851
Recoupment recognized in net sales		(2,880	)		—		(2,880	)		—
Contract liability ending balance	$	10,971		$	13,851	$	10,971		$	13,851

Other Contract Assets