Income Taxes	3 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	13. Income Taxes For interim income tax reporting, the Company estimates its annual effective tax rate and applies it to year-to-date pretax (loss) income, excluding unusual or infrequently occurring discrete items. Tax jurisdictions with losses for which tax benefits cannot be realized are excluded. The Company recorded income tax benefit of $0.3 million and $0.2 million for the three months ended December 31, 2019 and 2018, respectively. The effective income tax rate for the three months ended December 31, 2019 and 2018 differs from the U.S. federal statutory tax rate of 21% primarily due to the favorable impacts of the U.S. federal research and development tax credits in both periods, as well as stock award activity in the three-month period and operating results of our Irish subsidiary, where tax benefit is offset by a valuation allowance. The effective income tax rate for the three months ended December 31, 2019 and 2018 was impacted by discrete tax benefits of $0.2 million and $0.5 million, respectively, related to share awards vested, expired, cancelled and exercised during the periods. The total amount of unrecognized tax benefits, excluding interest and penalties that, if recognized, would affect the effective tax rate is $2.7 million and $2.1 million as of December 31, 2019 and September 30, 2019, respectively. Interest and penalties related to unrecognized tax benefits are recorded in the income tax (benefit) provision. The Company files income tax returns, including returns for its subsidiaries, in the U.S. federal jurisdiction and in various state jurisdictions as well as several non-U.S. jurisdictions. Uncertain tax positions are related to tax years that remain subject to examination. U.S. income tax returns for years prior to fiscal 2015 are no longer subject to examination by federal tax authorities. For tax returns for state and local jurisdictions, the Company is no longer subject to examination for tax years generally before fiscal 2009. For tax returns for non-U.S. jurisdictions, the Company is no longer subject to income tax examination for years prior to 2014. Additionally, the Company has been indemnified of liability for any taxes relating to Creagh Medical and NorMedix for periods prior to their respective acquisition dates, pursuant to the terms of the related share purchase agreements. As of December 31, 2019 and September 30, 2019, there were no undistributed earnings in foreign subsidiaries.

Income Taxes

3 Months Ended

Dec. 31, 2019

13. Income Taxes

For interim income tax reporting, the Company estimates its annual effective tax rate and applies it to year-to-date pretax (loss) income, excluding unusual or infrequently occurring discrete items. Tax jurisdictions with losses for which tax benefits cannot be realized are excluded. The Company recorded income tax benefit of $0.3 million and $0.2 million for the three months ended December 31, 2019 and 2018, respectively.

The effective income tax rate for the three months ended December 31, 2019 and 2018 differs from the U.S. federal statutory tax rate of 21% primarily due to the favorable impacts of the U.S. federal research and development tax credits in both periods, as well as stock award activity in the three-month period and operating results of our Irish subsidiary, where tax benefit is offset by a valuation allowance. The effective income tax rate for the three months ended December 31, 2019 and 2018 was impacted by discrete tax benefits of $0.2 million and $0.5 million, respectively, related to share awards vested, expired, cancelled and exercised during the periods.

The total amount of unrecognized tax benefits, excluding interest and penalties that, if recognized, would affect the effective tax rate is $2.7 million and $2.1 million as of December 31, 2019 and September 30, 2019, respectively. Interest and penalties related to unrecognized tax benefits are recorded in the income tax (benefit) provision.

The Company files income tax returns, including returns for its subsidiaries, in the U.S. federal jurisdiction and in various state jurisdictions as well as several non-U.S. jurisdictions. Uncertain tax positions are related to tax years that remain subject to examination. U.S. income tax returns for years prior to fiscal 2015 are no longer subject to examination by federal tax authorities. For tax returns for state and local jurisdictions, the Company is no longer subject to examination for tax years generally before fiscal 2009. For tax returns for non-U.S. jurisdictions, the Company is no longer subject to income tax examination for years prior to 2014. Additionally, the Company has been indemnified of liability for any taxes relating to Creagh Medical and NorMedix for periods prior to their respective acquisition dates, pursuant to the terms of the related share purchase agreements. As of December 31, 2019 and September 30, 2019, there were no undistributed earnings in foreign subsidiaries.