Revenue (Tables)

6 Months Ended

Jun. 30, 2016

Revenue [Abstract]

Differentiation of revenue and cost of revenue

Revenue and cost of revenue by source are as follows (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2016		2015		2016		2015
Revenue:
Products	$	67,155	$	74,522	$	133,030	$	140,682
Rentals	3,146		8,747		7,198		20,571
Services	2,018		3,761		4,380		8,151
	$	72,319	$	87,030	$	144,608	$	169,404
Cost of revenue:
Products	$	44,919	$	50,189	$	87,391	$	95,850
Rentals	1,026		3,687		2,326		9,943
Services	1,615		2,089		3,712		4,124
Depreciation	838		1,813		2,330		3,708
	$	48,398	$	57,778	$	95,759	$	113,625