Revenue

9 Months Ended

Sep. 30, 2012

Revenue [Abstract]

Revenue

Note 4 — Revenue

The Company differentiates revenue and cost of revenue dependent upon whether the source of revenue is attributable to products, rental or service revenues. Revenue and cost of revenue by source for the periods presented (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Revenue:
Product	$	56,621	$	54,841	$	170,302	$	128,508
Rental		16,374		16,632		51,420		45,590
Service		5,633		3,585		14,404		9,783
	$	78,628	$	75,058	$	236,126	$	183,881
Cost of Revenue:
Product	$	32,910	$	34,686	$	101,528	$	82,734
Rental		7,806		6,778		23,312		18,984
Service		2,271		1,302		5,665		3,554
Depreciation		1,798		1,575		5,302		4,503
	$	44,785	$	44,341	$	135,807	$	109,775