Share-based compensation

3 Months Ended

Mar. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based compensation

12. Share-based compensation

Components of share-based compensation expense are as follows:

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2022			2021
Cost of sales	$	211		$	178
Sales and marketing		981			717
General and administrative		3,218			2,529
Research and development		(78	)		297
Total	$	4,332		$	3,721

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2022		2021
Stock options	$	359	$	661
Time-based restricted stock awards and units		2,170		1,727
Market-based / performance-based restricted stock units		1,444		897
Stock purchase plan		359		436
Total	$	4,332	$	3,721

During the three months ended March 31, 2022 and 2021, the Company issued 4,885 and 50,510 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units.