v3.25.4
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:        
Net loss $ (12,432) $ (19,111) $ (23,727) $ (29,283)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization 112 128 166 158
Stock-based compensation 1,770 2,695 3,225 2,980
Noncash lease expense 11 157 246 224
Amortization of debt discount (related party) 1,465    
Interest expense on bridge loan (related party) 38    
Non-cash compensation related to common stock warrants issued to strategic advisory group 60 60
Loss on disposal of property and equipment 2 2 13
Changes in operating assets and liabilities:        
Payroll tax credit 331 567 427
Inventory (427) (919) (932) (1,114)
Prepaid expenses, vendor deposits and other current assets 52 365 451 (209)
Other assets (13) (31) (14) (41)
Accounts payable 846 (1,216) (1,096) 2,555
Deferred revenue (28) (1,232) (1,216) 1,252
Other current and noncurrent liabilities (402) 793 (265) (3,139)
Net cash used in operating activities (9,008) (17,978) (22,533) (26,177)
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchases of property and equipment (3) (8) (64)
Net cash used in investing activities (3) (8) (64)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Issuance of common stock and warrants upon February 2023 public offering, net of issuance costs     6,653
Issuance of common stock upon June 2023 public offering, net of issuance costs     8,066
Issuance of common stock upon November 2023 public offering, net of issuance costs     3,569
Proceeds from bridge loan (related party) 1,500    
Issuance of common stock, pre-funded warrants and common stock warrants in April 2024 sale, net of issuance costs 22,630 22,630
Issuance of common stock, net of issuance costs 1,606 490 1,680 3,203
Issuance of common stock upon exercise of stock options 15 15 109
Net cash provided by financing activities 3,106 23,135 24,325 21,600
Net increase/(decrease) in cash and cash equivalents (5,902) 5,154 1,784 (4,641)
Cash and cash equivalents at beginning of period 7,902 6,118 6,118 10,759
Cash and cash equivalents at end of period 2,000 11,272 7,902 6,118
SUPPLEMENTAL CASH FLOW INFORMATION:        
Cash paid for interest 2 5    
Cash paid for taxes    
NONCASH INVESTING AND FINANCING ACTIVITIES:        
Vesting of common stock issued upon early exercise 23 23 113
Warrants issued upon February 2023 public offering     1,473
Issuance of common stock warrant     124
Issuance of common stock warrants in April 2024 sale 8,756 8,756
Right of use asset recorded for operating lease liability 514 544
Original issue discount on bridge loan 3,000    
Issuance costs on bridge loan (related party) recorded in accounts payable 10    
Accrued interest on bridge loan (related party) in other current liabilities 28    
Amortization of original issue discount on bridge loan (related party) $ 1,465    
Right of use asset recorded for equipment finance lease     $ 50