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Income Taxes - Effective Tax Rate Reconciliation (Details)
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]    
U.S. federal statutory tax rate (percent) 21.00% 21.00%
State income taxes, net of federal tax benefit 1.50% (0.10%)
General business credits (2.00%) (1.40%)
Employee stock-based compensation (3.70%) (16.10%)
IRC 162(m) limitation 1.90% 2.70%
Other 0.40% 0.20%
Effective tax rate (percent) 19.10% 6.30%