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INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss carryforwards $ 64,583 $ 54,625
Research and development credit carryforward 18,531 15,468
Scientific research and experimental development deductions 36,155 33,321
Depreciation and amortization 6,684 6,349
Start-up costs 809 873
Stock-based compensation 1,939 498
Other accruals and reserves 1,431 654
Total deferred tax assets 130,132 111,788
Valuation Allowance (129,107) (110,981)
Total deferred tax assets, net 1,025 807
Deferred tax liabilities:    
Marketable securities (695) (315)
Loan payable (330) (492)
Total deferred tax liabilities (1,025) (807)
Net deferred tax assets (liabilities) $ 0 $ 0