Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 14,603	$ 19,497
Accounts receivable, net of allowance for doubtful accounts of $73 and $6 at December 31, 2022 and 2021, respectively	1,057	1,393
Inventories, net	4,965	4,601
Prepaid expenses and other current assets	362	300
Total current assets	20,987	25,791
Right of use asset	2,194	3,179
Property and equipment, net	702	95
Other assets	312	420
Total assets	24,195	29,485
Current liabilities:
Accounts payable	631	1,394
Accrued compensation	1,401	1,609
Accrued expenses and other current liabilities	657	718
Leasehold liability, current portion	1,092	985
Borrowings, current portion	14,165	0
Total current liabilities	17,946	4,706
Borrowings, long-term portion	0	12,287
Leasehold liability, long-term portion	1,102	2,194
Other long-term liabilities	1,001	575
Total liabilities	20,049	19,762
Commitments and Contingencies
Stockholders’ equity:
Convertible preferred stock issuable in series, par value of $0.001 Shares authorized: 5,000,000 at December 31, 2021 and 2020 Shares issued and outstanding: 60,961 and 56,451 at December 31, 2022 and 2021, respectively; aggregate liquidation preference related to Series A convertible preferred stock of $60,876 and $56,366 at December 31, 2022 and 2021, respectively	$ 0	$ 0
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000
Common stock, par value of $0.001; Shares authorized: 100,000,000 at December 31, 2021 and 2020; Shares issued and outstanding: 7,832,644 and 4,778,263 at December 31, 2022 and 2021, respectively	$ 8	$ 5
Additional paid-in capital	406,514	394,471
Accumulated deficit	(402,376)	(384,753)
Total stockholders’ equity	4,146	9,723
Total liabilities and stockholders’ equity	$ 24,195	$ 29,485