Share-based compensation

6 Months Ended

Jun. 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 June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2022		2021		2022		2021
Cost of sales	$	205	$	209	$	416	$	387
Sales and marketing		1,000		957		1,981		1,674
General and administrative		2,958		2,607		6,176		5,136
Research and development		297		134		219		431
Total	$	4,460	$	3,907	$	8,792	$	7,628

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2022		2021		2022		2021
Stock options	$	205	$	398	$	564	$	1,059
Time-based restricted stock awards and units		2,410		2,019		4,580		3,746
Market-based / performance-based restricted stock units		1,497		1,053		2,941		1,950
Stock purchase plan		348		437		707		873
Total	$	4,460	$	3,907	$	8,792	$	7,628

During the three months ended June 30, 2022 and 2021, the Company issued 157,979 and 194,745 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 six months ended June 30, 2022 and 2021, the Company issued 162,864 and 245,255 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units.