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Income Taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesThe Company recorded a tax provision related to its U.S. state taxes and the U.K. subsidiary during the three months ended March 31, 2021 and March 31, 2020. Due to the uncertainties surrounding the realization of the U.S. deferred tax assets through future taxable income, the Company has provided a full valuation allowance and, therefore, no benefit has been recognized for the U.S. net operating loss carryforwards and other deferred tax assets.