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Income Taxes - Effective Tax Rate Reconciliation (Details)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]    
U.S. federal statutory tax rate (percent) 21.00% 35.00%
State income taxes, net of federal tax benefit (0.10%) (0.50%)
General business credits (1.40%) (3.00%)
Employee stock-based compensation (16.10%) (8.20%)
IRC 162(M) Limitation 2.70% 1.70%
Other 0.20% (0.30%)
Effective tax rate (percent) 6.30% 24.70%