CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 2,748	$ 4,775
Accounts receivable, net	46	113
Prepaid expenses	450	378
Inventory, net	815	853
Total current assets	4,059	6,119
Right to use assets, operating leases	305	347
Property and equipment, net	259	294
Other noncurrent assets	22	22
Total assets	4,645	6,782
Current liabilities:
Accounts payable	215	540
Accrued expenses	584	560
Current portion of operating lease liability	184	180
Deferred revenue	33	44
Total current liabilities	1,016	1,324
Operating lease liability, less current portion	132	179
Total liabilities	1,148	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, 2,107,339 and 809,648 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	2	1
Additional paid-in capital	127,735	127,481
Accumulated deficit	(124,240)	(122,203)
Total stockholders’ equity	3,497	5,279
Total liabilities and stockholders’ equity	$ 4,645	$ 6,782