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Share-based compensation

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

14. 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)	2020		2019		2020		2019
Cost of sales	$	205	$	180	$	386	$	367
Sales and marketing		1,533		692		2,229		1,302
General and administrative		2,639		4,564		5,169		9,128
Research and development		322		413		774		737
Total	$	4,699	$	5,849	$	8,558	$	11,534

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2020		2019		2020		2019
Stock options	$	750	$	926	$	1,054	$	3,038
Time-based restricted stock awards and units		2,751		2,951		5,172		4,657
Market-based restricted stock units		810		1,576		1,480		2,923
Stock purchase plan		388		396		852		916
Total	$	4,699	$	5,849	$	8,558	$	11,534

During the three months ended June 30, 2020 and 2019, the Company issued 152,885 and 40,812 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, 2020 and 2019, the Company issued 186,444 and 251,893 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards and units.