CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash	$ 6,872	$ 3,085
Accounts receivable, net	244	415
Inventory, net	402	723
Prepaid expenses and other current assets	836	649
Total current assets	8,354	4,872
Property and equipment, net	0	3
Intangibles, net	432	604
Operating lease - right of use asset, net	65	142
Other assets	22	40
Total assets	8,873	5,661
Current liabilities:
Accounts payable	136	184
Accrued expenses and other current liabilities	763	1,074
Current portion of deferred revenue	234	436
Current portion of operating lease liabilities	68	219
Total current liabilities	1,201	1,913
Long-term liabilities:
Operating lease liabilities, net of current portion	0	17
Deferred revenue, net of current portion	57	114
Total liabilities	1,258	2,044
Commitments and contingencies (see Note 11)
Stockholders’ equity:
Preferred stock Series F, convertible; $.0001 par value; $6,375,000 stated value; 42,000 shares authorized, 6,375 and zero shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	0	0
Common stock, $.0001 par value; 150,000,000 shares authorized; 2,736,481 shares issued and 2,728,928 outstanding at June 30, 2023 and 2,070,861 shares issued and 2,063,308 shares outstanding at December 31, 2022	0	0
Treasury stock, 7,553 shares of common stock	(181)	(181)
Additional paid-in capital	233,911	227,645
Accumulated deficit	(226,115)	(223,847)
Total stockholders' equity	7,615	3,617
Total liabilities and stockholders’ equity	$ 8,873	$ 5,661