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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (3,895,000) $ (3,281,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 62,000 74,000
Stock-based compensation 205,000 181,000
Operating lease 15,000 38,000
Bad debt expense 0 6,000
Accretion of interest on held-to-maturity investments (6,000) 0
Changes in operating assets and liabilities:    
Accounts receivable (160,000) (141,000)
Prepaid expenses and other current assets (76,000) 139,000
Inventory 25,000 83,000
Accounts payable 131,000 (92,000)
Accrued expenses 81,000 286,000
Deferred revenue (20,000) 0
Net cash used in operating activities (3,638,000) (2,707,000)
Cash flows from investing activities:    
Maturity of held-to-maturity investment 1,000,000 0
Purchase of property and equipment 0 (83,000)
Net cash provided by (used in) investing activities 1,000,000 (83,000)
Cash flows from financing activities:    
Proceeds from the exercise of warrants, net 0 4,860,000
Proceeds from issuances of common stock, net 173,000 2,706,000
Repayments of notes payable (30,000) (28,000)
Net cash provided by financing activities 143,000 7,538,000
Increase (decrease) in cash and cash equivalents (2,495,000) 4,748,000
Cash and cash equivalents, beginning of period 7,575,000 1,307,000
Cash and cash equivalents, end of period 5,080,000 6,055,000
Supplemental cash flow information is as follows:    
Interest paid 4,000 11,000
Income taxes paid 0 0
Non-cash investing and financing activities:    
Operating lease entered into for right-to-use asset $ 0 $ 2,439,000