Balance Sheets - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 9,244,783	$ 5,593,582
Accounts receivable, net of allowance of $281,371 and $93,478 in 2016 and 2015, respectively	4,882,354	6,376,470
Inventories	5,400,015	4,504,282
Prepaid expenses and other current assets	774,427	668,659
Total current assets	20,301,579	17,142,993
Property and equipment, net	767,053	1,067,321
Intangible assets, net	486,399	635,889
Other assets	42,975	31,693
Total assets	21,598,006	18,877,896
Current liabilities:
Accounts payable	2,858,812	1,840,135
Accrued liabilities	5,223,591	6,058,390
Deferred revenue	6,445,352	7,445,935
Warrants	27,522,147	794,130
Total current liabilities	42,049,902	16,138,590
Long-term debt		18,080,159
Long-term deferred revenue	622,531	2,009,198
Other liabilities	388,213	275,603
Total liabilities	43,060,646	36,503,550
Preferred stock:
Preferred stock, par value $0.001; 10,000,000 shares authorized ; 24,000 shares and zero shares outstanding at 2016 and 2015, respectively	6,137,476
Stockholders' deficit:
Common stock, par value $0.001; 300,000,000 shares authorized, 21,895,206 and 21,551,173, shares issued at 2016 and 2015, respectively	21,895	21,551
Additional paid in capital	449,363,321	448,517,472
Treasury stock, 4,015 shares at 2016 and 2015	(205,999)	(205,999)
Accumulated deficit	(476,779,333)	(465,958,678)
Total stockholders' deficit	(27,600,116)	(17,625,654)
Total liabilities and stockholders' deficit	$ 21,598,006	$ 18,877,896