Balance Sheets - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 6,897,161	$ 3,949,135
Accounts receivable, net	949,969	738,729
Inventories	1,196,859	1,252,238
Prepaid expenses and other current assets	1,419,817	1,646,821
Total current assets	10,463,806	7,586,923
Fixed assets, net	471,127	532,706
Other long-term assets	154,407	164,262
Total assets	11,089,340	8,283,891
Current liabilities:
Accounts payable	404,068	734,048
Accrued compensation	521,192	307,471
Accrued expenses	1,394,976	1,648,731
Deferred revenue	745,204	628,236
Total current liabilities	3,065,440	3,318,486
Common stock warrants	171,651	4,641
Total liabilities	3,237,091	3,323,127
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value; 100,000,000 shares authorized at March 31, 2017 and December 31, 2016; 8,739,901 and 6,694,901 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	874	669
Additional paid-in capital	189,562,554	183,438,878
Accumulated deficit	(181,711,201)	(178,478,801)
Total stockholders’ equity	7,852,249	4,960,764
Total liabilities and stockholders’ equity	11,089,340	8,283,891
Non-Convertible Preferred Stock
Stockholders’ equity:
Preferred stock	0	0
Convertible preferred stock
Stockholders’ equity:
Preferred stock	$ 22	$ 18