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Income Taxes
3 Months Ended
Dec. 31, 2021
Income Taxes  
Income Taxes

12.            Income Taxes

An income tax expense of $12 thousand was recorded for the three months ended December 31, 2021 compared to an income tax expense of $110 thousand in the same period of 2020. The income tax expense for the three months ended December 31, 2021 was primarily driven by minimum state tax expenses, as the Company continues to maintain a full valuation allowance on its operations. The income tax expense for the three month period ended December 31, 2020 was driven by an increase in the valuation allowance against deferred tax assets in the period, offset by a benefit recorded for a change in tax law, allowing for the immediate deduction of covered expenses incurred through the Paycheck Protection Program.

We have in general historically calculated the provision for income taxes during interim reporting periods by applying an estimate of the annual effective tax rate for the full calendar year to ordinary income or loss for the reporting period. However, we used a discrete effective tax rate method to calculate income taxes for the quarter ended December 31, 2021 because we determined that our ordinary income or loss cannot be reliably estimated and small changes in estimated ordinary income would result in significant changes in the estimated annual effective tax rates.