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Income taxes
3 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income taxes
8.
Income taxes
In determining quarterly provisions for income taxes, the Company uses the annual estimated effective tax rate applied to the actual year-to-date profit or loss, adjusted for discrete items arising in that quarter. The Company’s annual estimated effective tax rate differs from the U.S. federal statutory rate primarily as a result of state taxes, foreign taxes, and changes in the Company’s valuation allowance against its deferred tax assets. For each of the three months ended December 31, 2020 and 2019, the Company recorded an immaterial provision for income taxes.