Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,597,718	$ 13,775,130
Accounts receivable, net of allowance of $421,419 and $383,077 in 2014 and 2013, respectively	6,456,312	7,558,152
Inventories	6,056,385	4,879,039
Prepaid expenses and other current assets	1,623,904	1,945,206
Total current assets	24,734,319	28,157,527
Property and equipment, net	988,232	1,184,589
Intangible assets, net	1,529,569	1,679,486
Long-term receivables		20,431
Other assets	34,233	34,363
Total assets	27,286,353	31,076,396
Current liabilities:
Short-term debt and current maturities of long-term debt		49,733
Accounts payable	3,155,401	3,512,339
Accrued liabilities	6,292,007	7,079,381
Deferred revenue	8,091,608	7,519,754
Warrants	5,539,639	5,644,626
Total current liabilities	23,078,655	23,805,833
Long-term debt, less current maturities	18,506,921	18,481,478
Long-term deferred revenue	402,016	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, 20,238,432 and 19,311,390 shares issued at 2014 and 2013, respectively	20,238	19,311
Additional paid in capital	444,969,310	441,888,155
Treasury stock, 4,015 shares at 2014 and 2013	(205,999)	(205,999)
Accumulated deficit	(459,484,788)	(453,403,462)
Total stockholders' deficit	(14,701,239)	(11,701,995)
Total liabilities and stockholders' deficit	$ 27,286,353	$ 31,076,396