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Income Taxes - Effective Tax Rate Reconciliation (Details)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]    
U.S. federal statutory tax rate (percent) 21.00% 21.00%
State income taxes, net of federal tax benefit (0.60%) 1.70%
General business credits (6.60%) (1.50%)
Employee stock-based compensation 1.80% (3.70%)
IRC 162(m) limitation 8.10% 2.40%
Nondeductible expenses 0.70% 0.10%
Other (0.50%) 0.20%
Effective tax rate (percent) 23.90% 20.20%