Inventories

12 Months Ended

Dec. 31, 2015

Inventory Disclosure [Abstract]

Inventories

2. Inventories

	December 31,
(U.S. Dollars in thousands)	2015		2014
Raw materials	$	4,976	$	3,879
Work-in-process		5,087		4,830
Finished products		23,155		24,953
Field inventory		17,593		18,003
Consignment inventory		2,199		2,656
Deferred cost of sales		4,553		5,525
	$	57,563	$	59,846