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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Current assets:    
Cash $ 1,386 $ 1,588
Accounts receivable, net 632 574
Inventories 1,273 1,263
Prepaid expenses and other current assets 302 96
Total current assets 3,593 3,521
Non-current inventories 260 266
Property and equipment, net 196 215
Intangible assets, net 779 800
Right-of-use assets 510 557
Deposits and other assets 31 31
Total assets 5,369 5,390
Current liabilities:    
Accounts payable 360 364
Accrued liabilities 578 485
Operating lease liabilities, current 288 276
Advances 250 250
Related party note payable $ 3,490 $ 3,457
Notes Payable, Current, Related Party, Type [Extensible Enumeration] us-gaap:RelatedPartyMember us-gaap:RelatedPartyMember
Total current liabilities $ 4,966 $ 4,832
Operating lease liabilities, net of current portion 367 445
Total liabilities 5,333 5,277
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 March 31, 2024 and December 31, 2023 8 8
Additional paid-in capital 106,413 106,276
Accumulated deficit (110,690) (110,476)
Total stockholders' deficit (4,264) (4,187)
Total liabilities, redeemable convertible preferred stock and stockholders' deficit 5,369 5,390
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 March 30, 2024 and December 31, 2023 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 $9,800 and $9,796 at March 31, 2024 and December 31, 2023, respectively $ 5 $ 5