Share-based compensation (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based 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 September 30,				Nine Months Ended September 30,
(U.S. Dollars, in thousands)	2014		2013		2014		2013
Cost of sales	$	40	$	27	$	98	$	(249	)
Sales and marketing		537		469		1,410		1,375
General and administrative		1,069		726		2,368		3,431
Research and development		84		55		227		157
Total	$	1,730	$	1,277	$	4,103	$	4,714