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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Statutory income tax (benefit) expense 21.00% 21.00% 21.00%
Foreign taxes 3.60% 0.20% (0.90%)
State income taxes, net of federal income taxes 10.20% 1.90% 3.40%
Income Tax credits (17.10%) (5.60%) (6.80%)
Incentive Stock options 9.90% (3.70%) 1.30%
Change in effective state rate 2.30% (0.10%) 0.30%
Deferred tax asset write-off 73.10% 31.40% 21.70%
Executive compensation limitation 15.60%    
Other 2.10% 0.70% 1.10%
Change in valuation allowance (175.40%) (135.90%) (53.90%)
Income tax expense (benefit) (54.70%) (90.10%) (12.80%)