Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Data (Unaudited)

18. Quarterly Financial Data (Unaudited)

	Quarter ended		Quarter ended		Quarter ended		Quarter ended
Year 2012	December 31,		September 30,		June 30,		March 31,
Product revenue	$	21,459,124	$	14,055,440	$	18,882,277	$	13,613,328
Total revenue		22,606,465		14,766,611		19,624,769		14,360,660
Cost of product revenue		7,269,886		7,221,028		8,084,226		6,413,481
Gross profit on product revenue		14,189,238		6,834,412		10,798,051		7,199,847
Net income	$	4,463,223	$	1,645,250	$	3,736,868	$	1,912,119
Per common share information:
Basic net income per share	$	0.33	$	0.12	$	0.28	$	0.15
Basic common shares outstanding		13,324,942		13,287,463		13,262,023		13,162,824
Diluted net income per share	$	0.31	$	0.11	$	0.26	$	0.14
Diluted common shares outstanding		14,299,211		14,459,154		14,443,794		14,089,946
	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