Share-based compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
(U.S. Dollars, in thousands)	2021		2020
Cost of sales	$	178	$	181
Sales and marketing		717		696
General and administrative		2,529		2,530
Research and development		297		452
Total	$	3,721	$	3,859

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2021		2020
Stock options	$	661	$	304
Time-based restricted stock awards and units		1,727		2,421
Market-based restricted stock units		897		670
Stock purchase plan		436		464
Total	$	3,721	$	3,859