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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Accrued expenses $ 729 $ 455
License Fees 1,004 1,168
Stock Options 4,671 3,759
Other 212 228
State net operating loss carryforwards 11,246 8,959
Federal net operating loss carryforwards 41,207 33,711
Total deferred tax assets 66,241 53,848
Valuation allowance (66,082) (53,669)
Net deferred tax asset (liability) 159 179
Federal    
Deferred Tax Assets    
Research tax credits 6,166 4,943
State    
Deferred Tax Assets    
Research tax credits $ 1,006 $ 625