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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesThe Company incurred a pretax loss in each of the three and nine months ended September 30, 2021 and 2020, which consists entirely of loss in the United States and resulted in no provision for income tax expense during the periods then ended. The effective tax rate is 0% in each of the three and nine months ended September 30, 2021 and 2020 because the Company has generated tax losses and has provided a full valuation allowance against its deferred tax assets.