Balance Sheets - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 11,991,731	$ 3,686,302
Accounts receivable, net of allowance of $297,409 and $361,350 in 2018 and 2017, respectively	4,793,396	4,287,255
Inventories, net	1,545,393	1,146,971
Prepaid expenses and other current assets	883,756	750,085
Total current assets	19,214,276	9,870,613
Property and equipment, net	366,447	592,688
Intangible assets, net	126,476	159,470
Other assets	262,037	44,432
Total assets	19,969,236	10,667,203
Current liabilities:
Accounts payable	1,353,215	1,654,101
Accrued liabilities	2,958,873	3,195,247
Deferred revenue	6,910,210	5,702,769
Warrants		19,574,977
Total current liabilities	11,222,298	30,127,094
Long-term deferred revenue	523,646	611,863
Other liabilities	534,413	535,369
Total liabilities	12,280,357	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, 58,933,384 and 22,805,731 shares issued at 2018 and 2017, respectively	58,933	22,806
Additional paid in capital	477,910,692	450,748,403
Treasury stock, 4,015 shares at 2018 and 2017	(205,999)	(205,999)
Accumulated deficit	(476,035,222)	(477,132,808)
Total stockholders' equity (deficit)	1,728,404	(26,567,598)
Total liabilities and stockholders' equity (deficit)	$ 19,969,236	$ 10,667,203