Income Taxes	3 Months Ended
Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate is 0% for the three-month periods ended March 31, 2019 and 2018, respectively. The Company's effective tax rate differs from the statutory federal tax rate of 21% for the three-month periods ended March 31, 2019 primarily due to a full valuation allowance recorded on our United States, China and Italy deferred tax assets since we cannot anticipate when or if we will have sufficient taxable income to utilize the deferred tax assets in the future. Further, our effective tax rate differs from the statutory federal tax rate due to state taxes, differences between U.S. and foreign tax rates, foreign losses incurred with no related tax benefit, non-deductible commissions, and non-deductible meals and entertainment expenses for the three- month periods ended March 31, 2019 and 2018. On April 3, 2019, the Company received notice from the Internal Revenue Service that our U.S. income tax return for the year ended December 31, 2016 is currently under audit. Fuel Tech had no unrecognized tax benefits as of March 31, 2019 and December 31, 2018.

Income Taxes

3 Months Ended

Mar. 31, 2019

The Company’s effective tax rate is 0% for the three-month periods ended March 31, 2019 and 2018, respectively. The Company's effective tax rate differs from the statutory federal tax rate of 21% for the three-month periods ended March 31, 2019 primarily due to a full valuation allowance recorded on our United States, China and Italy deferred tax assets since we cannot anticipate when or if we will have sufficient taxable income to utilize the deferred tax assets in the future. Further, our effective tax rate differs from the statutory federal tax rate due to state taxes, differences between U.S. and foreign tax rates, foreign losses incurred with no related tax benefit, non-deductible commissions, and non-deductible meals and entertainment expenses for the three- month periods ended March 31, 2019 and 2018.

On April 3, 2019, the Company received notice from the Internal Revenue Service that our U.S. income tax return for the year ended December 31, 2016 is currently under audit.

Fuel Tech had no unrecognized tax benefits as of March 31, 2019 and December 31, 2018.