Debt Financing	6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]
Debt Financing	Debt Financing On April 17, 2020, the Company received $1,556 in loan proceeds from the Paycheck Protection Program (the “PPP”), established pursuant to the recently enacted Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) and administered by the U.S. Small Business Administration (“SBA”). The unsecured loan is evidenced by a promissory note of the Company dated April 15, 2020 (the “Note”) in the principal amount of $1,556, issued to BMO Harris Bank N.A. (the “Bank”), the lender. Under the terms of the Note, interest will accrue on the outstanding principal at the rate of 1.0% per annum. The term of the Note is two years, though it may be payable sooner in connection with an event of default under the Note. To the extent the loan amount is not forgiven under the PPP, the Company is obligated to make equal monthly payments of principal and interest, beginning seven months from the date of the Note, until the maturity date. The Note contains covenants by the Company, including obtaining the written consent of the Bank prior to material changes in the management or ownership of the Company. 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 June 30, 2020 and December 31, 2019, respectively, the Company had outstanding standby letters of credit totaling approximately $2,860 and $2,461 under the BMO Harris agreement. As of June 30, 2020 and December 31, 2019 respectively, the Company held $3,003 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

On April 17, 2020, the Company received $1,556 in loan proceeds from the Paycheck Protection Program (the “PPP”), established pursuant to the recently enacted Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) and administered by the U.S. Small Business Administration (“SBA”). The unsecured loan is evidenced by a promissory note of the Company dated April 15, 2020 (the “Note”) in the principal amount of $1,556, issued to BMO Harris Bank N.A. (the “Bank”), the lender.

Under the terms of the Note, interest will accrue on the outstanding principal at the rate of 1.0% per annum. The term of the Note is two years, though it may be payable sooner in connection with an event of default under the Note. To the extent the loan amount is not forgiven under the PPP, the Company is obligated to make equal monthly payments of principal and interest, beginning seven months from the date of the Note, until the maturity date. The Note contains covenants by the Company, including obtaining the written consent of the Bank prior to material changes in the management or ownership of the Company.

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 June 30, 2020 and December 31, 2019, respectively, the Company had outstanding standby letters of credit totaling approximately $2,860 and $2,461 under the BMO Harris agreement. As of June 30, 2020 and December 31, 2019 respectively, the Company held $3,003 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.