Debt Financing	3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]
Debt Financing	Debt Financing On June 19, 2019, the Company entered into a Cash Collateral Security agreement with BMO Harris Bank, N.A. (the BMO Harris agreement) to use for the sole purpose of issuing standby letters of credit. The BMO Harris agreement requires us to pledge as cash collateral 105% of the aggregate face amount of outstanding standby letters of credit. The Company pays 250 basis points on the face values of outstanding letters of credit. There are no financial covenants set forth in the BMO Harris agreement. At March 31, 2020 and December 31, 2019, respectively, the Company had outstanding standby letters of credit totaling approximately $2,984 and $2,461 under the BMO Harris agreement. As of March 31, 2020 and December 31 2019 respectively, the Company held $3,133 and $2,584 in a separate restricted use designated BMO Harris Bank N.A. deposit account. Fuel Tech is committed to reimbursing the issuing bank for any payments made by the bank under these instruments. In connection with the transition to BMO Harris Bank N.A., the Company canceled its U.S. credit facility with JPMorgan Chase Bank, N.A. effective on September 25, 2019.

Debt Financing

3 Months Ended

Mar. 31, 2020

On June 19, 2019, the Company entered into a Cash Collateral Security agreement with BMO Harris Bank, N.A. (the BMO Harris agreement) to use for the sole purpose of issuing standby letters of credit. The BMO Harris agreement requires us to pledge as cash collateral 105% of the aggregate face amount of outstanding standby letters of credit. The Company pays 250 basis points on the face values of outstanding letters of credit. There are no financial covenants set forth in the BMO Harris agreement. At March 31, 2020 and December 31, 2019, respectively, the Company had outstanding standby letters of credit totaling approximately $2,984 and $2,461 under the BMO Harris agreement. As of March 31, 2020 and December 31 2019 respectively, the Company held $3,133 and $2,584 in a separate restricted use designated BMO Harris Bank N.A. deposit account. Fuel Tech is committed to reimbursing the issuing bank for any payments made by the bank under these instruments.

In connection with the transition to BMO Harris Bank N.A., the Company canceled its U.S. credit facility with JPMorgan Chase Bank, N.A. effective on September 25, 2019.