Balance Sheets - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 40,243,223	$ 43,939,512
Restricted cash - current	1,604,331
Compensating cash arrangement	251,548	250,620
Accounts receivable, net of allowance of $153,148 and $123,614 at 2021 and 2020, respectively	5,073,265	3,515,136
Inventories, net	3,854,572	3,295,457
Prepaid expenses and other current assets	2,383,673	1,716,014
Total current assets	53,410,612	52,716,739
Property and equipment, net	1,153,231	195,129
Restricted cash	700,000
Operating lease right-of-use assets	6,403,035	2,235,442
Other assets	253,416	308,515
Total assets	61,920,294	55,455,825
Current liabilities:
Short-term debt		1,185,058
Accounts payable	3,937,228	1,608,636
Accrued liabilities	2,562,390	3,209,235
Deferred revenue	6,688,239	5,282,770
Current portion of operating lease liabilities	654,611	2,287,487
Total current liabilities	13,842,468	13,573,186
Long-term debt		973,252
Long-term deferred revenue	1,793,298	548,915
Operating lease liabilities	5,911,757
Other liabilities	215,861	131,231
Total liabilities	21,763,384	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,74,579,198 and 73,694,203 shares issued at 2021 and 2020, respectively	74,579	73,694
Additional paid in capital	530,019,539	522,709,846
Treasury stock, 4,015 shares at 2021 and 2020	(205,999)	(205,999)
Accumulated deficit	(495,320,587)	(487,959,233)
Total stockholders’ equity	34,573,142	34,623,918
Total liabilities and stockholders’ equity	$ 61,920,294	$ 55,455,825