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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes

13. Income Taxes

The provision for income taxes for the three months ended March 31, 2021 and 2020 reflects current taxes, deferred taxes, and withholding taxes. The effective tax rate for each of the three months ended March 31, 2021 and 2020 was 0%. The valuation allowance against net deferred tax assets as of March 31, 2021, was $57,850, an increase of $2,211 from $55,639 as of December 31, 2020.

Excess tax benefits of $796 and $255 were recognized in the provision for income taxes for the three months ended March 31, 2021 and 2020, respectively, which were offset by $796 and $255 of valuation allowance, respectively.