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Income Taxes - Components of deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Federal net operating loss carryforwards $ 44,202 $ 41,207
State net operating loss carryforwards 12,104 11,246
Foreign net operating loss carryforwards 98  
Research and development (R&D) tax credits 9,358 7,172
Capitalized R&D expenses 9,312  
Stock based compensation 4,757 4,671
Accrued expenses   729
License Fees 840 1,004
Other 297 212
Total Deferred tax assets 80,968 66,241
Valuation Allowance $ (80,968) (66,082)
Net deferred tax assets   $ 159