Share-based compensation (Tables)

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Components of Share-Based Compensation Expense

Components of share-based compensation expense are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2021		2020		2021		2020
Cost of sales	$	200	$	149	$	587	$	535
Sales and marketing		831		668		2,505		2,897
General and administrative		2,531		2,770		7,667		7,939
Research and development		280		254		711		1,028
Total	$	3,842	$	3,841	$	11,470	$	12,399

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2021		2020		2021		2020
Stock options	$	382	$	786	$	1,441	$	1,840
Time-based restricted stock awards and units		1,819		1,632		5,565		6,804
Market-based restricted stock units		1,212		1,049		3,162		2,529
Stock purchase plan		429		374		1,302		1,226
Total	$	3,842	$	3,841	$	11,470	$	12,399