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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%

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- Definition

Effective Income Tax Rate Reconciliation, IRC 162(m) Limitation, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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