Balance Sheets (USD $)	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 4,113,768	$ 7,777,718
Accounts receivable, net of allowance of $338,419 and $640,183 in 2013 and 2012, respectively	8,466,808	11,551,651
Current portion of long-term receivables	19,299	18,838
Inventories	5,580,167	5,098,241
Prepaid expenses and other current assets	2,294,529	3,492,067
Total current assets	20,474,571	27,938,515
Property and equipment, net	1,639,398	2,141,923
Intangible assets, net	1,829,403	1,979,320
Long-term receivables	19,521	73,199
Other assets	32,525	32,987
Total assets	23,995,418	32,165,944
Liabilities and stockholders' deficit
Short-term debt and current maturities of long-term debt	12,061,454	12,264,490
Accounts payable	3,944,680	3,556,688
Accrued liabilities	5,637,004	5,361,810
Deferred revenue	8,376,807	9,502,939
Warrants and debt conversion features	1,469,042	2,968,348
Total current liabilities	31,488,987	33,654,275
Long-term debt, less current maturities	17,809,026	16,824,736
Long-term deferred revenue	334,664	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, 8,320,790 and 8,018,615 shares issued at 2013 and 2012, respectively	8,321	8,019
Additional paid in capital	367,133,231	366,053,627
Treasury stock, 4,015 shares at 2013 and 2012	(205,999)	(205,999)
Accumulated deficit	(392,572,812)	(384,645,873)
Total stockholders' deficit	(25,637,259)	(18,790,226)
Total liabilities and stockholders' deficit	$ 23,995,418	$ 32,165,944