Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Selected Quarterly Financial Data (Unaudited)

Schedule of selected unaudited consolidated statements of income

Quarter Ended	March 31			June 30		September 30		December 31
	(In thousands, except per share data)
2012:
Total revenues	$	58,467		$	57,631	$	58,648	$	60,427
Product revenues		57,904			57,185		58,371		59,998
Cost of product revenues		9,326			9,013		9,037		9,641
Net income		777			1,801		3,712		1,960
Basic net income per common share	$	0.03		$	0.06	$	0.12	$	0.06
Diluted net income per common share	$	0.02		$	0.06	$	0.11	$	0.06
2011:
Total revenues	$	49,810		$	50,846	$	52,058	$	53,397
Product revenues		49,458			50,493		51,661		53,155
Cost of product revenues		9,059			8,226		9,195		7,352
Net income (loss)		(286	)		2,348		3,225		2,559
Basic net income (loss) per common share	$	(0.01	)	$	0.08	$	0.11	$	0.09
Diluted net income (loss) per common share	$	(0.01	)	$	0.08	$	0.10	$	0.08