Revenue (Tables)

3 Months Ended

Mar. 31, 2015

Revenue [Abstract]

Differentiation of revenue and cost of revenue

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

	Three months ended March 31,
	2015		2014
Revenue:
Products	$	66,160	$	82,406
Rentals	11,824		13,923
Services	4,389		6,246
	$	82,373	$	102,575
Cost of revenue:
Products	$	45,624	$	47,732
Rentals	6,285		6,513
Services	2,042		2,715
Depreciation	1,895		1,934
	$	55,846	$	58,894