Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 7,270,301	$ 13,775,130
Accounts receivable, net of allowance of $131,464 and $383,077 in 2014 and 2013, respectively	6,480,499	7,558,152
Inventories	6,371,903	4,879,039
Prepaid expenses and other current assets	1,094,837	1,479,956
Total current assets	21,217,540	27,692,277
Property and equipment, net	894,728	1,184,589
Intangible assets, net	1,379,653	1,679,486
Long-term receivables		20,431
Other assets	388,850	499,613
Total assets	23,880,771	31,076,396
Current liabilities:
Short-term debt and current maturities of long-term debt		49,733
Accounts payable	2,353,133	3,512,339
Accrued liabilities	5,505,142	7,069,759
Deferred revenue	6,658,170	7,519,754
Warrants and debt conversion features	2,134,187	5,644,626
Total current liabilities	16,650,632	23,796,211
Long-term debt, less current maturities	18,388,764	18,481,478
Long-term deferred revenue	976,165	491,080
Other liabilities	414,928	9,622
Stockholders' deficit:
Preferred stock, par value $0.001; 10,000,000 shares authorized, none outstanding at 2014 and 2013
Common stock, par value $0.001; 300,000,000 shares authorized, 20,480,874 and 19,311,390 shares issued at 2014 and 2013, respectively	20,481	19,311
Additional paid in capital	446,241,703	441,888,155
Treasury stock, 4,015 shares at 2014 and 2013	(205,999)	(205,999)
Accumulated deficit	(458,605,903)	(453,403,462)
Total stockholders' deficit	(12,549,718)	(11,701,995)
Total liabilities and stockholders' deficit	$ 23,880,771	$ 31,076,396