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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company did not record any U.S. income tax expense during the three months ended March 31, 2024 and 2023. The Company has historically incurred operating losses and maintains a full valuation allowance against its U.S. net deferred tax assets. Foreign taxes were insignificant during the three months ended March 31, 2024 and 2023.

Net operating losses (NOLs) and tax credit carry-forwards are subject to review and possible adjustment by the Internal Revenue Service (“IRS”) and may become subject to annual limitation due to ownership changes that occur under Section 382 of the Internal Revenue Code, as amended and similar state provisions. These ownership changes may limit the amount of carryforwards that can be utilized annually to offset future taxable income. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain shareholders or public groups in the stock of a corporation by more than 50% over a three-year period. As of March 31, 2024, the Company was not limited on its NOLs and tax credit carry-forwards. The Company will continue to monitor future ownership changes for potential Section 382 limitations.
The Company files income tax returns in the United States, Canada, United Kingdom, Utah, California and Massachusetts. The Company is not currently under examination in any of these jurisdictions. The Company is subject to income tax examinations on all federal returns since the 2017 tax return.