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Income Taxes | 3 Months Ended
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Mar. 31, 2019
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes We file a consolidated federal income tax return for all of our wholly owned subsidiaries. For the three months ended March 31, 2019 and 2018, income tax expense was $81 and $80, respectively. Our effective tax rate for the three months ended March 31, 2019 and 2018 was 33.3% and 21.7%, respectively. The effective tax rate for the three months ended March 31, 2019 was primarily impacted by the increase to the valuation allowance related to the federal research and development credits that are no longer expected to be realizable. The effective tax rate for the three months ended March 31, 2018 was primarily impacted by the recognition of excess tax benefits related to share based compensation. We estimate our effective tax rate for the year ending December 31, 2019 will be approximately 24%. As of March 31, 2019 and December 31, 2018, we had a valuation allowance related to deferred tax assets of $88 and $66, respectively, that were not likely to be realized due to certain net operating loss limitations, including tax credits, and acquired net operating losses that were not more likely than not going to be utilized.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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