CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 1,952	$ 5,395
Accounts receivable, net	243	95
Prepaid expenses and other current assets	464	388
Inventory, net	899	795
Total current assets	3,558	6,673
Right to use assets, operating leases	97	210
Property and equipment, net	360	388
Other noncurrent assets	22	22
Total assets	4,037	7,293
Current liabilities:
Accounts payable	191	150
Accrued expenses	415	368
Current portion of operating lease liability	101	217
Current portion of notes payable	39	33
Deferred revenue	15	18
Total current liabilities	761	786
Notes payable, less current portion	162	156
Total liabilities	923	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, 515,340 shares and 514,003 shares issued and outstanding as of June 30, 2024 and December 31, 2023, respectively	1	1
Additional paid-in capital	136,442	136,263
Accumulated deficit	(133,329)	(129,913)
Total stockholders’ equity	3,114	6,351
Total liabilities and stockholders’ equity	$ 4,037	$ 7,293