Income Taxes	9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s effective tax rate of 42% and 23% for the nine-month periods ended September 30, 2015 and 2014, respectively, differs from the statutory federal tax rate of 34% due primarily 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. Fuel Tech had unrecognized tax benefits of $155 and $117 as of September 30, 2015 and December 31, 2014, respectively, all of which, if ultimately recognized, will reduce Fuel Tech's annual effective tax rate.

Income Taxes

9 Months Ended

Sep. 30, 2015

The Company’s effective tax rate of 42% and 23% for the nine-month periods ended September 30, 2015 and 2014, respectively, differs from the statutory federal tax rate of 34% due primarily 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.

Fuel Tech had unrecognized tax benefits of $155 and $117 as of September 30, 2015 and December 31, 2014, respectively, all of which, if ultimately recognized, will reduce Fuel Tech's annual effective tax rate.