Balance Sheets (USD $)	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 23,260,465	$ 35,248,819
Accounts receivable, net of allowance of $241,690 and $367,536 in 2011 and 2010, respectively	10,178,401	13,915,569
Current portion of long-term receivables	64,271	30,800
Inventories	5,915,043	5,441,475
Prepaid expenses and other current assets	3,586,186	4,557,718
Total current assets	43,004,366	59,194,381
Property and equipment, net	3,725,044	3,840,622
Intangible assets, net	2,429,070	2,578,986
Long-term receivables	79,730	109,266
Other assets	44,609	38,537
Total assets	49,282,819	65,761,792
Liabilities and stockholders' equity
Short-term debt and current maturities of long-term debt	24,533,194	20,894,091
Accounts payable	7,930,044	8,796,182
Accrued liabilities	7,851,494	6,966,571
Deferred revenue	6,699,750	6,600,313
Warrants	2,901,043	3,541,798
Total current liabilities	49,915,525	46,798,955
Long-term debt, less current maturities	6,000,000	8,000,000
Long-term deferred revenue	398,352	478,850
Other liabilities	3,848	8,741
Stockholders' equity:
Preferred stock, par value $0.001; 10,000,000 shares authorized at 2011 and 2010, none outstanding at 2011 and 2010	0	0
Common stock, par value $0.001; 100,000,000 shares authorized at 2011 and 2010, 55,431,423 and 54,746,240 shares issued at 2011 and 2010, respectively	55,431	54,746
Additional paid in capital	355,736,551	354,002,770
Treasury stock, 40,151 shares at 2011 and 2010	(205,999)	(205,999)
Accumulated deficit	(362,620,889)	(343,376,271)
Total stockholders' equity (deficit)	(7,034,906)	10,475,246
Total liabilities and stockholders' equity	$ 49,282,819	$ 65,761,792