Share-based compensation (Tables)

3 Months Ended

Mar. 31, 2014

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)	2014		2013
Cost of sales	$	29	$	287
Sales and marketing		444		436
General and administrative		916		1,175
Research and development		72		45
Total	$	1,461	$	1,943