v3.25.4
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - 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 $ (18,103) $ (17,197) $ (20,823) $ (13,036)
Adjustments to reconcile net loss to net cash used in operating activities:        
Change in fair value of convertible debt 623      
Non-cash amortization of other debt discount 56 48 59 82
Change in fair value of embedded derivative   16 (158)  
Provision for excess and obsolete inventory 227   402 807
Stock-based compensation expense 5,192 7,401 7,735 1
Issuance of restricted stock units 390      
Depreciation 7 9 12 32
Bad debt expense 31      
Loss on extinguishment of debt   52 359 1,541
Changes in operating assets and liabilities:        
Accounts receivable (472) 631 1,864 1,814
Inventory 710 1,022 (105) (210)
Prepaid expenses and other assets (1,002) (306) (256) (491)
Accounts payable (1,691) 1,880 921 558
Accrued expenses 50 160 (1,089) 707
Deferred revenue (641) 1,147 601 (1,403)
Accrued interest 598 1,287 1,604 1,303
Net cash used in operating activities (14,025) (3,850) (8,874) (6,410)
Cash flows from investing activities:        
Capital expenditures (21) (8) (13) (5)
Net cash used in investing activities (21) (8) (13) (5)
Cash flows from financing activities:        
Proceeds from convertible debt 13,000 5,000 5,000  
Repayments of convertible debt (156)      
Proceeds from other debt issuances 4,000 3,500 3,500 11,378
Fees paid for debt issuance (61)   (18) (151)
Fees paid for other term loan issuances   (18)    
Repayment of other debt issuances (6,836) (3,948) (5,524) (2,239)
Proceeds from issuance of common stock from equity line-of-credit 3,605      
Fees paid for deferred offering costs   (541) (2,537) (402)
Proceeds from exercise of common stock options 157 34 34 3
Net cash provided by financing activities 13,709 4,027 10,482 5,587
Effects of exchange rate changes on cash and cash equivalents (256) (93) 141 (105)
Net decrease in cash, cash equivalents and restricted cash (593) 76 1,736 (933)
Cash, cash equivalents and restricted cash, beginning of period 4,864 3,128 3,128 4,061
Cash, cash equivalents and restricted cash, end of period 4,271 3,204 4,864 3,128
Supplemental disclosure of cash flow information:        
Cash paid for interest 387 1,307 1,704 1,457
Cash paid for income taxes 17      
Non-cash investing and financing activities:        
Leased assets obtained in exchange for new operating lease liabilities   295 295  
Issuance of NCNV in exchange for related party debt and accrued interest   5,190 5,190 36,918
Issuance of SAFE agreements in exchange for accrued liabilities   3,250 3,250  
Unpaid deferred offering costs   $ 1,256   $ 120
Conversion of convertible debt principal and interest payments into common stock $ 3,907   $ 5,882