Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2011

18. Quarterly Financial Data (Unaudited)

	Quarter ended		Quarter ended		Quarter ended		Quarter ended
Year 2011	December 31,		September 30,		June 30,		March 31,
Product revenue	$	17,725,546	$	17,756,000	$	15,414,681	$	11,060,159
Total revenue		18,444,287		18,455,817		16,140,852		11,737,679
Cost of product revenue		7,128,450		7,394,922		6,655,804		5,604,562
Gross profit on product revenue		10,597,096		10,361,078		8,758,877		5,455,597
Net income	$	2,883,110	$	2,976,518	$	2,282,641	$	324,412
Per common share information:
Basic net income per share	$	0.22	$	0.23	$	0.18	$	0.03
Basic common shares outstanding		13,122,004		12,817,910		12,725,216		12,688,819
Diluted net income per share	$	0.21	$	0.22	$	0.17	$	0.02
Diluted common shares outstanding		13,804,806		13,765,533		13,739,836		13,744,710

	Quarter ended		Quarter ended		Quarter ended		Quarter ended
Year 2010	December 31,		September 30,		June 30,		March 31,
Product revenue	$	14,193,352	$	13,179,399	$	13,720,929	$	11,642,050
Total revenue		14,721,492		13,869,214		14,499,800		12,466,087
Cost of product revenue		6,702,674		6,108,502		5,891,752		5,123,675
Gross profit on product revenue		7,490,678		7,070,897		7,829,177		6,518,375
Net income	$	1,350,701	$	1,184,265	$	1,066,752	$	714,280
Per common share information:
Basic net income per share	$	0.11	$	0.09	$	0.08	$	0.06
Basic common shares outstanding		12,641,394		12,633,405		12,645,889		12,614,808
Diluted net income per share	$	0.10	$	0.09	$	0.08	$	0.05
Diluted common shares outstanding		13,672,245		13,622,603		13,642,322		13,628,376

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

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