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Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets    
Accrued expenses $ 455 $ 277
License fees 1,168 1,332
Stock Options 3,759 2,584
Other 228 115
State net operating loss carryforwards 8,959 7,431
Federal net operating loss carryforwards 33,711 47,845
Total deferred tax assets 53,848 63,864
Valuation allowance (53,669) (63,737)
Net deferred tax asset (liability) 179 127
Federal    
Deferred Tax Assets    
Research tax credits 4,943 3,770
State    
Deferred Tax Assets    
Research tax credits $ 625 $ 510