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Income Tax
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Tax Income Tax
The Company’s effective income tax rate was 0.8% and 0.4% for the three and six months ended June 30, 2021, respectively, and (0.3)% and (0.2)% for the three and six months ended June 30, 2020, respectively.
Income tax expense of $0.8 million and $0.5 million for the three and six months ended June 30, 2021, respectively, was primarily due to the change in valuation allowance against the Company’s deferred tax assets during the first three and six months of 2021. Income tax expense of $0.2 million and $0.3 million for the three and six months ended June 30, 2020, respectively, was primarily attributable to the change in valuation allowance against the Company’s deferred tax assets during the three and six months ended June 30, 2020.
Deferred tax assets are evaluated by considering historical levels of income, estimates of future taxable income, and the impact of tax planning strategies. The Company continues to evaluate its deferred tax asset valuation allowance on a quarterly basis.
As of June 30, 2021, the Company’s 2017 and 2018 federal tax returns were under audit by the IRS.
As of June 30, 2021, the Company had no material uncertain tax positions.