Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 11,301,844	$ 13,775,130
Accounts receivable, net of allowance of $377,452 and $383,077 in 2014 and 2013, respectively	8,347,212	7,558,152
Inventories	5,573,124	4,879,039
Prepaid expenses and other current assets	1,929,076	1,945,206
Total current assets	27,151,256	28,157,527
Property and equipment, net	1,047,926	1,184,589
Intangible assets, net	1,604,528	1,679,486
Long-term receivables		20,431
Other assets	34,425	34,363
Total assets	29,838,135	31,076,396
Current liabilities:
Short-term debt and current maturities of long-term debt		49,733
Accounts payable	3,155,036	3,512,339
Accrued liabilities	7,804,406	7,079,381
Deferred revenue	8,814,091	7,519,754
Warrants and debt conversion features	6,720,765	5,644,626
Total current liabilities	26,494,298	23,805,833
Long-term debt, less current maturities	18,492,619	18,481,478
Long-term deferred revenue	441,583	491,080
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, 19,407,340 and 19,311,390 shares issued at 2014 and 2013, respectively	19,407	19,311
Additional paid in capital	442,139,537	441,888,155
Treasury stock, 4,015 shares at 2014 and 2013	(205,999)	(205,999)
Accumulated deficit	(457,543,310)	(453,403,462)
Total stockholders' deficit	(15,590,365)	(11,701,995)
Total liabilities and stockholders' deficit	$ 29,838,135	$ 31,076,396