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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The provision for income taxes for the three months ended March 31, 2024 and 2023 was approximately $1.0 million and $0.5 million, respectively.

The provision for income taxes for the three months ended March 31, 2024 consisted primarily of U.S. federal and U.S. state tax expense as a result of IRC Section 174 research and experimental capitalization requirements, and foreign current income tax expense due to the Company's intercompany cost-plus operating model. The provision for income taxes for the three months ended March 31, 2023 consisted primarily of state and foreign current income tax expense.
For the three months ended March 31, 2024, the provision for income taxes differed from the statutory amount primarily due to certain U.S. and foreign jurisdictions where a full valuation allowance was maintained against the net deferred tax assets. For the three months ended March 31, 2023, the provision for income taxes differed from the statutory amount primarily due to domestic state income taxes, foreign income taxes and the Company realizing no benefit for prior year domestic losses due to maintaining a full valuation allowance against its domestic net deferred tax assets.
The realization of tax benefits from deferred tax assets is dependent upon future levels of taxable income, of an appropriate character, in the periods the items are expected to be deductible or taxable. Based on the weight of the available objective evidence, the Company does not believe it is more likely than not that the U.S. or U.K. net deferred tax assets will be realizable. Accordingly, the Company has provided a full valuation allowance against such net deferred tax assets as of March 31, 2024 and December 31, 2023. The Company intends to maintain the valuation allowance until sufficient positive evidence exists to support a reversal of, or decrease in, the valuation allowance. During the three months ended March 31, 2024, there were no material changes to the total amount of unrecognized tax benefits.