CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 2,196	$ 4,775
Accounts receivable, net	44	113
Prepaid expenses	330	378
Inventory, net	765	853
Total current assets	3,335	6,119
Right to use assets, operating leases	261	347
Property and equipment, net	245	294
Other noncurrent assets	22	22
Total assets	3,863	6,782
Current liabilities:
Accounts payable	120	540
Accrued expenses	621	560
Current portion of operating lease liability	188	180
Deferred revenue	24	44
Total current liabilities	953	1,324
Operating lease liability, less current portion	83	179
Total liabilities	1,036	1,503
Commitments and contingencies (see notes)
Stockholders’ equity:
Preferred stock, $0.001 par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 2,964,485 and 809,648 shares issued and outstanding as of June 30, 2023 and December 31, 2022, respectively	3	1
Additional paid-in capital	129,057	127,481
Accumulated deficit	(126,233)	(122,203)
Total stockholders’ equity	2,827	5,279
Total liabilities and stockholders’ equity	$ 3,863	$ 6,782