Share-based compensation (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-Based Compensation by Line Item in Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)

The following tables present the detail of share-based compensation by line item in the condensed consolidated statements of operations and comprehensive income (loss) as well as by award type:

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2019		2018		2019		2018
Cost of sales	$	169	$	151	$	536	$	408
Sales and marketing		583		514		1,885		1,436
General and administrative		4,760		4,194		13,888		11,488
Research and development		332		402		1,069		1,060
Total	$	5,844	$	5,261	$	17,378	$	14,392

	Three Months Ended September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2019		2018		2019		2018
Stock options	$	599	$	579	$	3,637	$	2,442
Time-based restricted stock awards and units		3,805		2,244		8,462		5,480
Performance-based restricted stock awards and units		—		734		—		1,493
Market-based restricted stock units		1,092		1,298		4,015		3,855
Stock purchase plan		348		406		1,264		1,122
Total	$	5,844	$	5,261	$	17,378	$	14,392