Share-based compensation

6 Months Ended

Jun. 30, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

10. Share-based compensation

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

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2017		2016		2017		2016
Cost of sales	$	137	$	109	$	286	$	226
Sales and marketing		319		280		679		556
General and administrative		2,005		1,376		4,107		2,934
Research and development		215		148		420		296
	$	2,676	$	1,913	$	5,492	$	4,012

	Three Months Ended June 30,				Six Months Ended June 30,
(U.S. Dollars, in thousands)	2017		2016		2017		2016
Stock options	$	523	$	467	$	1,118	$	942
Time-based restricted stock awards		1,239		1,130		2,531		2,438
Performance-based restricted stock awards		113		—		225		—
Performance-based and market-based restricted stock units		472		—		938		—
Stock purchase plan		329		316		680		632
	$	2,676	$	1,913	$	5,492	$	4,012

During the three months ended June 30, 2017 and 2016, the Company issued 76,596 and 325,393 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards. During the six months ended June 30, 2017 and 2016, the Company issued 291,275 and 528,791 shares, respectively, of common stock related to stock purchase plan issuances, stock option exercises and the vesting of restricted stock awards.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

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