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The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the reported securities beneficially owned, 29,050 shares are represented by unvested RSUs."}],"balance_after":39775,"source":{"system":"sec-edgar","filing":"0001179110-21-000525","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911021000525/edgar.xml","form_type":"4"}},{"id":3077160,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2020-07-23T16:37:28.000Z","date":"2020-07-21","kind":"grant","acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The stock option award was granted under the Issuer's 2013 Stock Incentive Plan. The stock option vests and becomes exercisable over a four-year period commencing on July 21, 2020. Twenty-five percent (25%) of the stock option vests and becomes exercisable on July 21, 2021 (first anniversary of the date of grant) and the balance vests in twelve equal quarterly installments over the remaining three years of the four-year period, subject to continued service with the Issuer."}],"balance_after":50000,"derivative":{"exercise_price":2.48,"expiration_date":"2030-07-21","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001179110-20-008430","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911020008430/edgar.xml","form_type":"4"}},{"id":3312008,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2020-01-14T18:56:27.000Z","date":"2020-01-10","kind":"grant","acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock option award was granted under the Issuer's 2013 Stock Incentive Plan. The stock option vests and becomes exercisable over a four-year period commencing on January 10, 2020. Twenty-five percent (25%) of the stock option vests and becomes exercisable on January 10, 2021 (first anniversary of the date of grant) and the balance vests in twelve equal quarterly installments over the remaining three years of the four-year period, subject to continued service with the Issuer."}],"balance_after":50000,"derivative":{"exercise_price":1.79,"expiration_date":"2030-01-10","underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001179110-20-000565","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911020000565/edgar.xml","form_type":"4"}},{"id":3312007,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Common Stock","published_at":"2020-01-14T18:56:27.000Z","date":"2020-01-10","kind":"grant","acquired":true,"shares":20000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") award granted under the Issuer's 2013 Stock Incentive Plan. Each RSU represents a right to receive one share of Issuer common stock. The RSU award vests over a four-year period commencing on January 10, 2020. Twenty-five percent (25%) of the shares subject to the RSU award shall vest on each one-year anniversary of the grant date of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Securities beneficially owned totaling 41,240 includes 7,665 shares of Issuer common stock owned and 33,575 of unvested RSU's held by the reporting person."}],"balance_after":41240,"source":{"system":"sec-edgar","filing":"0001179110-20-000565","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911020000565/edgar.xml","form_type":"4"}},{"id":3312006,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Common Stock","published_at":"2020-01-14T18:10:11.000Z","date":"2020-01-07","kind":"sale","acquired":false,"shares":1603,"price":1.7804,"value":2853.9812,"ownership":{"direct":true},"footnotes":[{"field":"deemedExecutionDate","element":"deemedExecutionDate","label":"F1","text":"The Form 4 filed on January 10, 2020 did not include the Deemed Execution Date in Column 2A and corresponding footnote disclosure. This amendment to the Form 4 is being filed to include this information for the reported transaction."},{"field":"deemedExecutionDate","element":"deemedExecutionDate","label":"F2","text":"In accordance with terms of the RSU agreement, the \"sell to cover\" provision is intended to comply with the requirements of Rule 10b5-1(c)(1) under the Exchange Act and be interpreted to comply with the requirements of Rule 10b5-1(c) under the Exchange Act."},{"field":"shares","element":"transactionShares","label":"F3","text":"Represents the number of shares of Issuer common stock required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of 4,525 Restricted Stock Units (\"RSUs\") on January 3, 2020. This sale is mandated by the Issuer's election under its 2013 Stock Incentive Plan to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary trade by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $1.76 to $1.82 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Of the reported shares, 13,575 shares are represented by unvested RSUs."}],"balance_after":21240,"source":{"system":"sec-edgar","filing":"0001179110-20-000560","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911020000560/edgar.xml","form_type":"4/A","original_submission_date":"2020-01-10"}},{"id":3313943,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Common Stock","published_at":"2020-01-10T08:07:10.000Z","date":"2020-01-07","kind":"sale","acquired":false,"shares":1603,"price":1.7804,"value":2853.9812,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of shares of Issuer common stock required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of 4,525 Restricted Stock Units (\"RSUs\") on January 3, 2020. This sale is mandated by the Issuer's election under its 2013 Stock Incentive Plan to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary trade by the Reporting Person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $1.76 to $1.82 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of the reported shares, 13,575 shares are represented by unvested RSUs."}],"balance_after":21240,"source":{"system":"sec-edgar","filing":"0001179110-20-000446","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911020000446/edgar.xml","form_type":"4"}},{"id":3463860,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2019-07-11T17:17:10.000Z","date":"2019-07-09","kind":"grant","acquired":true,"shares":45500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The stock option award was granted under the Issuer's 2013 Stock Incentive Plan. The stock option vests and becomes exercisable over a four-year period commencing on July 9, 2019. Twenty-five percent (25%) of the stock option vests and becomes exercisable on July 9, 2020 (first anniversary of the date of grant) and the balance vests in twelve equal quarterly installments over the remaining three years of the four-year period, subject to continued service with the Issuer."}],"balance_after":45500,"derivative":{"exercise_price":2.52,"expiration_date":"2029-07-09","underlying":"Common Stock","underlying_shares":45500},"source":{"system":"sec-edgar","filing":"0001179110-19-008594","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911019008594/edgar.xml","form_type":"4"}},{"id":3702552,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2019-01-07T20:14:50.000Z","date":"2019-01-03","kind":"grant","acquired":true,"shares":45500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock option award was granted under the Issuer's 2013 Stock Incentive Plan. The stock option vests and becomes exercisable over a four-year period commencing on January 3, 2019. Twenty-five percent (25%) of the stock option vests and becomes exercisable on January 3, 2020 (first anniversary of the date of grant) and the balance vests in twelve equal quarterly installments over the remaining three years of the four-year period, subject to continued service with the Issuer."}],"balance_after":45500,"derivative":{"exercise_price":3.14,"expiration_date":"2029-01-03","underlying":"Common Stock","underlying_shares":45500},"source":{"system":"sec-edgar","filing":"0001179110-19-000528","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911019000528/edgar.xml","form_type":"4"}},{"id":3702551,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Common Stock","published_at":"2019-01-07T20:14:50.000Z","date":"2019-01-03","kind":"grant","acquired":true,"shares":18100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a restricted stock unit (\"RSU\") award granted under the Issuer's 2013 Stock Incentive Plan. Each RSU represents a right to receive one share of Issuer common stock. The RSU award vests over a four-year period commencing on January 3, 2019. Twenty-five percent (25%) of the shares subject to the RSU award shall vest on each one-year anniversary of the grant date of the award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Securities beneficially owned totaling 22,843 includes 4,743 shares of Issuer common stock owned and 18,100 of unvested RSU's held by the reporting person."}],"balance_after":22843,"source":{"system":"sec-edgar","filing":"0001179110-19-000528","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911019000528/edgar.xml","form_type":"4"}},{"id":3720200,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Common Stock","published_at":"2018-12-26T09:17:48.000Z","date":"2018-12-21","kind":"purchase","acquired":true,"shares":4000,"price":3.05,"value":12200.0,"ownership":{"direct":true},"balance_after":4743,"source":{"system":"sec-edgar","filing":"0001179110-18-014243","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911018014243/edgar.xml","form_type":"4"}},{"id":3817465,"issuer":{"id":110652,"kind":"organization","name":"Aceragen, Inc.","symbol":"ACGN"},"owners":[{"id":67554,"kind":"person","name":"Lim Bryant David","position":1,"cik":"0001752888","reported_name":"Lim Bryant David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP and General Counsel"}}],"security":"Stock Option (Right to Buy)","published_at":"2018-09-13T16:20:33.000Z","date":"2018-09-10","kind":"grant","acquired":true,"shares":130000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option was granted under the Company's 2013 Stock Incentive Plan.  The option vests and becomes exercisable over a four-year period commencing on September 10, 2018. Twenty-five percent (25%) of the option vests and becomes exercisable on September 10, 2019 (first anniversary of the date of grant) and the balance vests in twelve equal quarterly installments over the remaining three years of the four-year period, subject to continued service with the Issuer."}],"balance_after":130000,"derivative":{"exercise_price":9.29,"expiration_date":"2028-09-10","underlying":"Common Stock","underlying_shares":130000},"source":{"system":"sec-edgar","filing":"0001179110-18-011368","document":"edgar.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/861838/000117911018011368/edgar.xml","form_type":"4"}}]}