Share-based compensation

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-based compensation

14. 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)	2020		2019		2020		2019
Cost of sales	$	149	$	169	$	535	$	536
Sales and marketing		668		583		2,897		1,885
General and administrative		2,770		4,760		7,939		13,888
Research and development		254		332		1,028		1,069
Total	$	3,841	$	5,844	$	12,399	$	17,378

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2020		2019		2020		2019
Stock options	$	786	$	599	$	1,840	$	3,637
Time-based restricted stock awards and units		1,632		3,805		6,804		8,462
Market-based restricted stock units		1,049		1,092		2,529		4,015
Stock purchase plan		374		348		1,226		1,264
Total	$	3,841	$	5,844	$	12,399	$	17,378

During the three months ended September 30, 2020 and 2019, the Company issued 58,357 and 43,603 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, 2020 and 2019, the Company issued 244,801 and 295,496 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises, and the vesting of restricted stock awards and units.