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Share-based compensation

3 Months Ended

Mar. 31, 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 March 31,
(U.S. Dollars, in thousands)	2020		2019
Cost of sales	$	181	$	187
Sales and marketing		696		610
General and administrative		2,530		4,564
Research and development		452		324
Total	$	3,859	$	5,685

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2020		2019
Stock options	$	304	$	2,112
Time-based restricted stock awards and units		2,421		1,706
Market-based restricted stock units		670		1,347
Stock purchase plan		464		520
Total	$	3,859	$	5,685

During the three months ended March 31, 2020 and 2019, the Company issued 33,559 and 211,081 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards and units.