Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We account for income taxes in accordance with Accounting Standard Codification, or ASC, 740, Income Taxes, which requires an estimate of the annual effective tax rate for the full year to be applied to the interim period, taking into account year-to-date amounts and projected results for the full year. Our effective tax rate could fluctuate significantly from quarter to quarter based on recurring and nonrecurring factors including, but not limited to: variations in the estimated and actual level of pre-tax income or loss by jurisdiction; changes in enacted tax laws and regulations, and interpretations thereof, including with respect to tax credits and state and local income taxes; developments in tax audits and other matters; recognition of excess tax benefits and tax deficiencies from stock-based compensation and certain nondeductible expenses. Changes in judgment from the evaluation of new information resulting in the recognition, derecognition, or remeasurement of a tax position taken in a prior annual period are recognized separately in the quarter of the change. We recorded a benefit from income taxes of $5.9 million and a provision for income taxes of $3.1 million for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, we recorded a benefit from income taxes of $6.8 million and provision for income taxes of $1.6 million, respectively. The effective tax rate for the three months ended September 30, 2021 and 2020 was 13.0% and 24.9%, respectively. For the nine months ended September 30, 2021 and 2020, the effective tax rate was approximately 7.2% and 77.5%, respectively. The difference from the federal statutory rate of 21% was primarily due to the valuation allowance against foreign losses, the recognition of significant excess tax benefits of stock-based compensation and other discrete adjustments. Gross unrecognized tax benefits were $7.8 million and $7.2 million as of September 30, 2021 and December 31, 2020, respectively. The gross unrecognized tax benefits, if recognized, would result in a reduction of approximately $7.8 million to the provision for income taxes thereby favorably impacting our effective tax rate. Our policy is to recognize interest and penalties related to income tax matters in income tax expense. For the periods presented, interest and penalties related to income tax positions were not material to our unaudited condensed consolidated financial statements. We are subject to taxation and file income tax returns in the U.S. at the federal, state levels, and in foreign jurisdictions. The federal income tax return for the years 2017 through 2019 and state income tax returns for the tax years 2008 through 2019 remain open to examination. We are under examination in one state and, while the outcome cannot be predicted at this time, it is not expected to have an impact on our results of operations, cash flows and financial condition.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.