Balance Sheets (USD $)	Mar. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 10,468,699	$ 13,954,919
Accounts receivable, net of allowance of $704,328 and $667,529 in 2012 and 2011, respectively	10,293,481	11,104,038
Current portion of long-term receivables	59,811	59,679
Inventories	7,214,994	6,036,051
Prepaid expenses and other current assets	3,416,740	3,081,484
Total current assets	31,453,725	34,236,171
Property and equipment, net	3,061,673	3,323,856
Intangible assets, net	2,204,195	2,279,153
Long-term receivables	31,118	51,892
Other assets	41,635	40,760
Total assets	36,792,346	39,931,832
Liabilities and stockholders' deficit
Short-term debt and current maturities of long-term debt	26,731,186	21,173,321
Accounts payable	6,003,094	5,610,181
Accrued liabilities	5,510,409	5,703,166
Deferred revenue	8,277,817	8,220,306
Warrants	313,485	125,415
Total current liabilities	46,835,991	40,832,389
Long-term debt, less current maturities	12,720,806	17,290,531
Long-term deferred revenue	602,520	634,713
Other liabilities	1,561	3,094
Stockholders' deficit:
Preferred stock, par value $0.001; 10,000,000 shares authorized at 2012 and 2011, none outstanding at 2012 and 2011
Common stock, par value $0.001; 100,000,000 shares authorized at 2012 and 2011, 56,372,466 and 55,431,573 shares issued at 2012 and 2011, respectively	56,372	55,432
Additional paid in capital	358,001,453	356,729,118
Treasury stock, 40,151 shares at 2012 and 2011	(205,999)	(205,999)
Accumulated deficit	(381,220,358)	(375,407,446)
Total stockholders' deficit	(23,368,532)	(18,828,895)
Total liabilities and stockholders' deficit	$ 36,792,346	$ 39,931,832