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Income Taxes - Effective Tax Rate Reconciliation (Details) | 6 Months Ended
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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 Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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