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Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":6250,"derivative":{"underlying":"Common Stock","underlying_shares":6250},"source":{"system":"sec-edgar","filing":"0001437749-26-010080","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926010080/rdgdoc.xml","form_type":"4"}},{"id":1604864,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Restricted Stock Units","published_at":"2024-03-04T21:02:35.000Z","date":"2024-02-29","kind":"grant","planned":false,"acquired":true,"shares":9400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":9400,"derivative":{"underlying":"Common Stock","underlying_shares":9400},"source":{"system":"sec-edgar","filing":"0001437749-24-006417","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924006417/rdgdoc.xml","form_type":"4"}},{"id":2243153,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:06:21.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":64394,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":64394,"derivative":{"underlying":"Common Stock","underlying_shares":64394},"source":{"system":"sec-edgar","filing":"0001437749-22-014394","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014394/rdgdoc.xml","form_type":"4"}},{"id":3021983,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2020-09-28T21:00:40.000Z","date":"2020-09-25","kind":"purchase","acquired":true,"shares":5329,"price":0.7197,"value":3835.2813,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.7098 to $0.72, inclusive. The reporting person undertakes to\nprovide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the\nrange set forth in this footnote."}],"balance_after":292045,"source":{"system":"sec-edgar","filing":"0001437749-20-020365","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920020365/rdgdoc.xml","form_type":"4"}},{"id":3023251,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2020-09-24T21:56:25.000Z","date":"2020-09-24","kind":"purchase","acquired":true,"shares":33886,"price":0.6412,"value":21727.7032,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. 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The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":286716,"source":{"system":"sec-edgar","filing":"0000846913-20-000044","document":"wf-form4_160098456816259.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691320000044/wf-form4_160098456816259.xml","form_type":"4"}},{"id":3339874,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-12-17T21:37:44.000Z","date":"2019-12-16","kind":"tax_withholding","acquired":false,"shares":8523,"price":0.905,"value":7713.315,"ownership":{"direct":true},"balance_after":252830,"source":{"system":"sec-edgar","filing":"0000846913-19-000103","document":"wf-form4_157661864724065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000103/wf-form4_157661864724065.xml","form_type":"4"}},{"id":3406059,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-09-26T21:21:43.000Z","date":"2019-09-26","kind":"purchase","acquired":true,"shares":28489,"price":0.9669,"value":27546.0141,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.94966 to $1.00, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":261353,"source":{"system":"sec-edgar","filing":"0000846913-19-000077","document":"wf-form4_156953288755404.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000077/wf-form4_156953288755404.xml","form_type":"4"}},{"id":3406671,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-09-25T21:21:54.000Z","date":"2019-09-25","kind":"purchase","acquired":true,"shares":21511,"price":0.9584,"value":20616.1424,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. 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The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":232864,"source":{"system":"sec-edgar","filing":"0000846913-19-000075","document":"wf-form4_156944649859101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000075/wf-form4_156944649859101.xml","form_type":"4"}},{"id":3580372,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-03-25T20:46:08.000Z","date":"2019-03-21","kind":"grant","acquired":true,"shares":25000,"price":1.83,"value":45750.0,"ownership":{"direct":true},"balance_after":211353,"source":{"system":"sec-edgar","filing":"0000846913-19-000025","document":"wf-form4_155354675412171.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000025/wf-form4_155354675412171.xml","form_type":"4"}},{"id":3872046,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2018-07-06T20:07:03.000Z","date":"2018-06-29","kind":"purchase","acquired":true,"shares":10200,"price":1.079,"value":11005.8,"ownership":{"direct":true},"balance_after":186353,"source":{"system":"sec-edgar","filing":"0001358637-18-000006","document":"wf-form4_153090760670708.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000135863718000006/wf-form4_153090760670708.xml","form_type":"4"}}]}