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INCOME TAXES - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets:    
Net operating loss carryforwards $ 32,568 $ 26,441
Capitalized R&D expenses 5,087 5,657
Research and development tax credits 1,318 1,318
Accrued expenses 443 95
Operating lease liabilities 212 306
Other 42 13
Total deferred tax assets 39,670 33,830
Valuation allowance (39,295) (33,384)
Deferred tax assets less valuation allowance 375 446
Deferred tax liabilities:    
Depreciation (132) (151)
Operating lease right-of-use assets (202) (295)
Unrealized gains/losses (41) 0
Total deferred tax liabilities (375) (446)
Net deferred tax assets $ 0 $ 0