Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 9,560,130	$ 7,777,718
Accounts receivable, net of allowance of $634,813 and $640,183 in 2013 and 2012, respectively	9,842,360	11,551,651
Current portion of long-term receivables	19,067	18,838
Inventories	5,487,887	5,098,241
Prepaid expenses and other current assets	3,475,578	3,492,067
Total current assets	28,385,022	27,938,515
Property and equipment, net	1,878,753	2,141,923
Intangible assets, net	1,904,361	1,979,320
Long-term receivables	18,906	73,199
Other assets	34,158	32,987
Total assets	32,221,200	32,165,944
Liabilities and stockholders' deficit
Short-term debt and current maturities of long-term debt	12,317,760	12,264,490
Accounts payable	4,737,918	3,556,688
Accrued liabilities	5,038,255	5,361,810
Deferred revenue	9,943,607	9,502,939
Warrants and debt conversion features	2,364,271	2,968,348
Total current liabilities	34,401,811	33,654,275
Long-term debt, less current maturities	20,175,614	16,824,736
Long-term deferred revenue	359,606	477,159
Stockholders' deficit:
Preferred stock, par value $0.001; 10,000,000 shares authorized, none outstanding at 2013 and 2012
Common stock, par value $0.001; 300,000,000 shares authorized, 8,145,930 and 8,018,615 shares issued at 2013 and 2012, respectively	8,146	8,019
Additional paid in capital	367,048,042	366,053,627
Treasury stock, 4,015 shares at 2013 and 2012	(205,999)	(205,999)
Accumulated deficit	(389,566,020)	(384,645,873)
Total stockholders' deficit	(22,715,831)	(18,790,226)
Total liabilities and stockholders' deficit	$ 32,221,200	$ 32,165,944