Balance Sheets - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,570,566	$ 3,686,302
Accounts receivable, net of allowance of $300,510 and $361,350 in 2018 and 2017, respectively	5,088,111	4,287,255
Inventories, net	1,202,457	1,146,971
Prepaid expenses and other current assets	970,397	750,085
Total current assets	18,831,531	9,870,613
Property and equipment, net	452,639	592,688
Intangible assets, net	109,979	159,470
Other assets	226,939	44,432
Total assets	19,621,088	10,667,203
Current liabilities:
Accounts payable	1,574,035	1,654,101
Accrued liabilities	2,822,958	3,195,247
Deferred revenue	6,365,676	5,702,769
Warrants		19,574,977
Total current liabilities	10,762,669	30,127,094
Long-term deferred revenue	502,893	611,863
Other liabilities	621,573	535,369
Total liabilities	11,887,135	31,274,326
Convertible Preferred stock:
Convertible Preferred stock, par value $0.001; 10,000,000 shares authorized, 23,900 shares outstanding at 2018 and 2017	5,960,475	5,960,475
Stockholders' equity (deficit):
Common stock, par value $0.001; 300,000,000 shares authorized, 59,044,164 and 22,805,731 shares issued at 2018 and 2017, respectively	59,044	22,806
Additional paid in capital	478,071,950	450,748,403
Treasury stock, 4,015 shares at 2018 and 2017	(205,999)	(205,999)
Accumulated deficit	(476,151,517)	(477,132,808)
Total stockholders' equity (deficit)	1,773,478	(26,567,598)
Total liabilities and stockholders' equity (deficit)	$ 19,621,088	$ 10,667,203