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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Cash Flows from Operating Activities    
Net loss $ (43,907) $ (34,907)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 566 498
Amortization of debt discount on convertible notes 57
Asset impairment and disposal 857
Stock based compensation 24,313 14,766
Changes in operating assets and liabilities:    
Grant funds receivable 855 (510)
Prepaids and other 364 40
Deposits and other long-term assets (89) 743
Accounts payable 1,423 (4,503)
Accrued expenses 1,378 352
Unearned reservation fees (8) 223
Other long-term liabilities
Operating lease assets and liability, net (153) (118)
Net cash used in operating activities (15,258) (22,502)
Cash Flows from Investing Activities    
Purchase of property and equipment (1,434) (3,570)
Net cash used in investing activities (1,434) (3,570)
Cash Flows from Financing Activities    
Proceeds from sale of common stock 14,328 23,462
Proceeds from 2024 convertible notes 618
Proceeds from exercise of stock options 7
Common stock issuance costs (1,188) (1,822)
Net cash provided by financing activities 13,140 22,265
Increase (decrease) in cash and cash equivalents (3,552) (3,807)
Cash and cash equivalents, beginning of period 13,160 16,967
Cash and cash equivalents, end of period 9,608 13,160
Supplemental disclosures of cash flow information:    
Cash paid for interest 15 10
Cash paid for income taxes 1
Non-cash investing and financing activities:    
Subscriptions receivable 131 281
Stock-based compensation included in common stock issuance costs 375
Shares issued for conversion of convertible notes payable and accrued interest $ 703