Share-based compensation (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Share-Based Compensation by Line Item in Consolidated Statements of Operations

The following table shows the detail of share-based compensation by line item in the condensed consolidated statements of operations:

	Three Months Ended March 31,
(U.S. Dollars, in thousands)	2015		2014
Cost of sales	$	111	$	29
Sales and marketing		306		444
General and administrative		1,269		642
Research and development		91		72
Total	$	1,777	$	1,187