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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Percentage of pre-tax income:    
U.S. federal statutory income tax rate 21.00% 21.00%
State taxes, net of federal benefit 11.00% 12.00%
Credits 4.00% 3.00%
Non-deductible items (1.00%) 0.00%
Provision to return 1.00% 1.00%
Stock based compensation shortfall (1.00%) (1.00%)
Change in state rate 0.00% 3.00%
Deconsolidation of Caelum 0 (3)
Change in valuation allowance (35.00%) (36.00%)
Change in subsidiary basis 1.00% (1.00%)
Other (1.00%) 1.00%
Effective income tax rate 0.13% 0.00%