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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities:    
Net loss $ (20,181,000) $ (15,406,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation 1,940,000 1,638,000
Amortization of discounts on marketable securities (359,000) (441,000)
Non-cash lease expense 44,000 40,000
Depreciation 23,000 14,000
Amounts receivable 14,000 75,000
Prepaid expenses and other assets (86,000) (453,000)
Deposits 0 1,108,000
Accounts payable 1,337,000 321,000
Accrued liabilities 72,000 (1,643,000)
Net cash used in operating activities (17,196,000) (14,747,000)
Cash flows from investing activities:    
Purchase of marketable securities (23,650,000) (16,370,000)
Maturities and sales of marketable securities 29,790,000 31,967,000
Purchase of property and equipment (11,000) (18,000)
Net cash provided by (used in) investing activities 6,129,000 15,579,000
Cash flows from financing activities:    
Proceed from the exercise of common stock options 555,000 257,000
Principal payments on finance lease obligations (6,000) (5,000)
Net cash provided by financing activities 549,000 252,000
Net increase (decrease) in cash and cash equivalents (10,518,000) 1,084,000
Cash and cash equivalents at beginning of period 15,647,000 3,025,000
Cash and cash equivalents at end of period 5,129,000 4,109,000
Supplemental disclosure of cash flow information:    
Cash paid for income taxes $ 13,000 $ 12,000