Balance Sheet - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 38,738,591	$ 43,939,512
Restricted cash - current	454,268
Compensating cash arrangement		250,620
Accounts receivable, net of allowance of $179,913 and $123,614 at 2021 and 2020, respectively	5,405,860	3,515,136
Inventories, net	4,433,394	3,295,457
Prepaid expenses and other current assets	2,356,190	1,716,014
Total current assets	51,388,303	52,716,739
Property and equipment, net	2,631,891	195,129
Restricted cash	951,563
Operating lease right-of-use assets	5,734,775	2,235,442
Other assets	278,154	308,515
Total assets	60,984,686	55,455,825
Current liabilities:
Short-term debt		1,185,058
Accounts payable	4,188,471	1,608,636
Accrued liabilities	2,528,189	3,209,235
Deferred revenue	6,276,781	5,282,770
Current portion of operating lease liabilities	268,121	2,287,487
Total current liabilities	13,261,562	13,573,186
Long-term debt		973,252
Long-term deferred revenue	2,238,150	548,915
Operating lease liabilities	5,842,456
Other liabilities	218,582	131,231
Total liabilities	21,560,750	15,226,584
Series A - Convertible preferred stock:
Convertible preferred stock, Series A, par value $0.001; 22,387 and 22,513 shares outstanding at 2021 and 2020, respectively	5,583,768	5,605,323
Stockholders’ equity:
Convertible preferred stock, Series B, par value $0.001; 10,000,000 shares authorized, 5,610,121 shares outstanding at 2021 and 2020	5,610	5,610
Common stock, par value $0.001; 300,000,000 shares authorized, 74,618,240 and 73,694,203 shares issued at 2021 and 2020, respectively	74,618	73,694
Additional paid in capital	532,640,795	522,709,846
Treasury stock, 4,015 shares at 2021 and 2020	(205,999)	(205,999)
Accumulated deficit	(498,674,856)	(487,959,233)
Total stockholders’ equity	33,840,168	34,623,918
Total liabilities and stockholders’ equity	$ 60,984,686	$ 55,455,825