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Income taxes
 9 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
The estimated effective annual tax rate as of September 30, 2023 and 2022 for the years ended December 31, 2023 and 2022, excluding the impact of discrete adjustments, was (5)% and 4%, respectively. The decrease in the estimated effective annual tax rate is primarily due to valuation allowance and goodwill impairment charges. The Company recorded a discrete tax expense (benefit) of $1.0 million and $1.0 million for the three and nine months ended September 30, 2023, respectively, and $(9.0) million and $(7.3) million for the three and nine months ended September 30, 2022, respectively. The discrete tax expense in 2023 was due to return-to-provision adjustments and share-based compensation activity which was entirely offset by a valuation allowance charge. The discrete benefit in 2022 was primarily due to return-to-provision adjustments and the benefit of the release of an indemnified uncertain tax position offset by share-based compensation activity.
The Company establishes valuation allowances for deferred income tax assets in accordance with U.S. GAAP, which provides that such valuation allowances shall be established unless realization of the income tax benefits is more likely than not. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. At each reporting period, the Company considers the scheduled reversal of deferred tax liabilities and assets, available taxes in carryback periods, tax planning strategies and projected future taxable income in making this assessment.
In 2022, the Company determined that it was more likely than not that certain deferred tax assets would not be realized due to reductions in estimates of future profitability and disclosure related to substantial doubt about the Company's ability to continue as a going concern. Accordingly, the Company recorded an additional valuation allowance charge of $163.1 million in calculating the estimated annual tax rate for the year ended December 31, 2023.