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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Current assets:    
Cash $ 1,430 $ 742
Accounts receivable, net 644 747
Inventory, net 1,317 1,384
Prepaid expenses and other current assets 267 90
Total current assets 3,658 2,963
Non-current inventory, net 288 286
Property and equipment, net 243 248
Intangible assets, net 817 878
Right-of-use assets 603 727
Deposits and other assets 32 33
Total assets 5,641 5,135
Current liabilities:    
Accounts payable 303 322
Accrued liabilities 442 508
Operating lease liabilities, current 263 230
Advances 250 250
Related party note payable $ 3,424 $ 3,325
Notes Payable, Current, Related Party, Type [Extensible Enumeration] us-gaap:RelatedPartyMember us-gaap:RelatedPartyMember
Total current liabilities $ 4,682 $ 4,635
Operating lease liabilities, net of current portion 518 720
Total liabilities 5,200 5,355
Commitments and contingencies (Note 8)
Stockholders' deficit:    
Common stock, $0.001 par value; 120,000,000 shares authorized; 8,004,389 shares issued and outstanding at September 30, 2023 and December 31, 2022 8 8
Additional paid-in capital 106,146 105,812
Accumulated deficit (110,018) (110,345)
Total stockholders' deficit (3,859) (4,520)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit 5,641 5,135
Series D Redeemable Convertible Preferred Stock [Member]    
Current liabilities:    
Series D redeemable convertible preferred stock, $0.001 par value; 50 shares authorized; 43 shares issued and outstanding; liquidation preference of $4,300 at September 30, 2023 and December 31, 2022 4,300 4,300
Nonredeemable Convertible Preferred Stock [Member]    
Stockholders' deficit:    
Non-redeemable convertible preferred stock, $0.001 par value; 10,004,310 and 10,004,310 shares authorized; 5,254,310 and 5,254,310 shares issued and outstanding; liquidation preference of $9,793 and $9,781 at September 30, 2023 and December 31, 2022, respectively $ 5 $ 5