Revenue recognition and accounts receivable (Tables)

12 Months Ended

Dec. 31, 2021

Revenue Recognition And Accounts Receivable [Abstract]

The table below presents net sales, which includes product sales and marketing service fees, for each of the years ended December 31, 2021, 2020, and 2019.

	For the year ended December 31,
(U.S. Dollars, in thousands)	2021		2020		2019
Product sales	$	409,554	$	353,087	$	397,064
Marketing service fees		54,925		53,475		62,891
Net sales	$	464,479	$	406,562	$	459,955

Allowances for Expected Credit Losses

The following table provides a detail of changes in the Company’s allowance for expected credit losses for the years ended December 31, 2021, and 2020:

	For the year ended December 31,
(U.S. Dollars, in thousands)	2021			2020
Allowance for expected credit losses beginning balance	$	4,848		$	3,987
Impact of adoption of ASU 2016-13		—			1,120
Current period provision for expected credit losses		444			199
Writeoffs charged against the allowance and other		(126	)		(714	)
Effect of changes in foreign exchange rates		(222	)		256
Allowance for expected credit losses ending balance	$	4,944		$	4,848

Schedule of Changes in Contract Liability

The following table provides a detail of changes in the Company’s contract liability associated with the Accelerated and Advanced Payment Program for the years ended December 31, 2021, and 2020:

	For the Year Ended December 31,
(U.S. Dollars, in thousands)	2021			2020
Contract liability beginning balance	$	13,851		$	—
Additions		—			13,851
Recoupment recognized in net sales		(9,060	)		—
Contract liability ending balance	$	4,791		$	13,851