Balance Sheets (USD $)	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 13,954,919	$ 35,248,819
Accounts receivable, net of allowance of $667,529 and $367,536 in 2011 and 2010, respectively	11,104,038	13,915,569
Current portion of long-term receivables	59,679	30,800
Inventories	6,036,051	5,441,475
Prepaid expenses and other current assets	3,081,484	4,557,718
Total current assets	34,236,171	59,194,381
Property and equipment, net	3,323,856	3,840,622
Intangible assets, net	2,279,153	2,578,986
Long-term receivables	51,892	109,266
Other assets	40,760	38,537
Total assets	39,931,832	65,761,792
Liabilities and stockholders' equity (deficit)
Short-term debt and current maturities of long-term debt	21,173,321	20,894,091
Accounts payable	5,610,181	8,796,182
Accrued liabilities	5,703,166	6,966,571
Deferred revenue	8,220,306	6,600,313
Warrants	125,415	3,541,798
Total current liabilities	40,832,389	46,798,955
Long-term debt, less current maturities	17,290,531	8,000,000
Long-term deferred revenue	(634,713)	(478,850)
Other liabilities	3,094	8,741
Stockholders' equity (deficit):
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, 55,431,573 and 54,746,240 shares issued at 2011 and 2010, respectively	55,432	54,746
Additional paid in capital	356,729,118	354,002,770
Treasury stock, 40,151 shares at 2011 and 2010	(205,999)	(205,999)
Accumulated deficit	(375,407,446)	(343,376,271)
Total stockholders' equity (deficit)	(18,828,895)	10,475,246
Total liabilities and stockholders' equity (deficit)	$ 39,931,832	$ 65,761,792