Balance Sheets - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 3,969,218	$ 3,949,135
Accounts receivable, net	423,444	738,729
Inventories	1,786,074	1,252,238
Prepaid expenses and other current assets	2,041,935	1,646,821
Total current assets	8,220,671	7,586,923
Fixed assets, net	417,290	532,706
Other long-term assets	134,695	164,262
Total assets	8,772,656	8,283,891
Current liabilities:
Accounts payable	725,224	734,048
Accrued compensation	692,937	307,471
Accrued expenses	1,911,062	1,648,731
Deferred revenue	925,794	628,236
Total current liabilities	4,255,017	3,318,486
Common stock warrants	0	4,641
Total liabilities	4,255,017	3,323,127
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value; 100,000,000 shares authorized at September 30, 2017 and December 31, 2016; 2,145,519 and 836,862 shares issued and outstanding at September 30, 2017 and December 31, 2016, respectively	215	84
Additional paid-in capital	192,975,377	183,439,463
Accumulated deficit	(188,457,980)	(178,478,801)
Total stockholders’ equity	4,517,639	4,960,764
Total liabilities and stockholders’ equity	8,772,656	8,283,891
Non-Convertible Preferred Stock
Stockholders’ equity:
Preferred stock	0	0
Convertible preferred stock
Stockholders’ equity:
Preferred stock	$ 27	$ 18