Other current liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Payables And Accruals [Abstract]

Summary of Other Current Liabilities

	December 31,
(U.S. Dollars, in thousands)	2018		2017
Accrued expenses	$	6,206	$	6,984
Salaries, bonuses, commissions and related taxes payable		21,608		24,635
Accrued distributor commissions		10,073		9,192
Accrued legal and settlement expenses		4,196		7,673
Contingent consideration liability		13,600		—
Non-income taxes payable		3,638		3,180
Other payables		8,598		9,631
Other current liabilities	$	67,919	$	61,295