Share-based compensation

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Share-based compensation

12. Share-based compensation

Components of share-based compensation expense are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2022		2021		2022		2021
Cost of sales	$	195	$	200	$	611	$	587
Sales and marketing		948		831		2,929		2,505
General and administrative		3,285		2,531		9,461		7,667
Research and development		301		280		520		711
Total	$	4,729	$	3,842	$	13,521	$	11,470

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2022		2021		2022		2021
Stock options	$	294	$	382	$	858	$	1,441
Time-based restricted stock awards and units		2,467		1,819		7,047		5,565
Market-based / performance-based restricted stock units		1,626		1,212		4,567		3,162
Stock purchase plan		342		429		1,049		1,302
Total	$	4,729	$	3,842	$	13,521	$	11,470

During the three months ended September 30, 2022 and 2021, the Company issued 7,057 and 72,281 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units. During the nine months ended September 30, 2022 and 2021, the Company issued 169,921 and 317,536 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units.