CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 3,562	$ 5,395
Accounts receivable, net	161	95
Prepaid expenses	346	388
Inventory, net	874	795
Total current assets	4,943	6,673
Right to use assets, operating leases	154	210
Property and equipment, net	353	388
Other noncurrent assets	22	22
Total assets	5,472	7,293
Current liabilities:
Accounts payable	116	150
Accrued expenses	391	368
Current portion of operating lease liability	159	217
Current portion of note payable	34	33
Deferred revenue	15	18
Total current liabilities	715	786
Note payable, less current portion	147	156
Total liabilities	862	942
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, 5,144,632 shares and 5,140,024 shares issued and outstanding as of March 31, 2024 and December 31, 2023, respectively	5	5
Additional paid-in capital	136,350	136,259
Accumulated deficit	(131,745)	(129,913)
Total stockholders’ equity	4,610	6,351
Total liabilities and stockholders’ equity	$ 5,472	$ 7,293