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The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects the number of shares of Series A Preferred and Series A-1 Preferred, as applicable, held by the Reporting Person on an as-converted to common stock basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"Reflects the number of shares of Series A Preferred and Series A-1 Preferred, as applicable, held by the Reporting Person on an as-converted to common stock basis."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":167938},"source":{"system":"sec-edgar","filing":"0001104659-17-061574","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1370483/000110465917061574/a4.xml","form_type":"4"}},{"id":4188770,"issuer":{"id":3693,"kind":"organization","name":"RHYTHM PHARMACEUTICALS, INC.","symbol":"RYTM"},"owners":[{"id":172587,"kind":"organization","name":"Ipsen, S.A.","position":1,"cik":"0001370483","reported_name":"Ipsen, S.A.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A-1 Junior Preferred Stock","published_at":"2017-10-10T16:22:25.000Z","date":"2017-10-10","kind":"exercise","acquired":false,"shares":45831,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"The owner of record of the securities is Sutrepa SAS.Sutrepa SAS is controlled by Ipsen SA"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects the number of shares of Series A Preferred and Series A-1 Preferred, as applicable, held by the Reporting Person on an as-converted to common stock basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"Reflects the number of shares of Series A Preferred and Series A-1 Preferred, as applicable, held by the Reporting Person on an as-converted to common stock basis."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":45831},"source":{"system":"sec-edgar","filing":"0001104659-17-061574","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1370483/000110465917061574/a4.xml","form_type":"4"}},{"id":4188769,"issuer":{"id":3693,"kind":"organization","name":"RHYTHM PHARMACEUTICALS, INC.","symbol":"RYTM"},"owners":[{"id":172587,"kind":"organization","name":"Ipsen, S.A.","position":1,"cik":"0001370483","reported_name":"Ipsen, S.A.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-10-10T16:22:25.000Z","date":"2017-10-10","kind":"purchase","acquired":true,"shares":20000,"price":17,"value":340000.0,"ownership":{"direct":false,"nature":"The owner of record of the securities is Ipsen Pharma, S.A.S., which is controlled by Ipsen SA"},"balance_after":833099,"source":{"system":"sec-edgar","filing":"0001104659-17-061574","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1370483/000110465917061574/a4.xml","form_type":"4"}},{"id":4188768,"issuer":{"id":3693,"kind":"organization","name":"RHYTHM PHARMACEUTICALS, INC.","symbol":"RYTM"},"owners":[{"id":172587,"kind":"organization","name":"Ipsen, S.A.","position":1,"cik":"0001370483","reported_name":"Ipsen, S.A.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-10-10T16:22:25.000Z","date":"2017-10-10","kind":"exercise","acquired":true,"shares":167938,"ownership":{"direct":false,"nature":"The owner of record of the securities is Sutrepa SAS. Sutrepa SAS is controlled by Ipsen SA"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In connection with the closing of the Issuer's initial public offering, each share of the Issuer's series A convertible preferred stock (the \"Series A Preferred\") and series A-1 junior preferred stock (the \"Series A-1 Preferred\") converted into the Issuer's common stock on a 9.17-for-one basis without payment or consideration.  The Series A Preferred and the Series A-1 Preferred had no expiration date."}],"balance_after":813099,"source":{"system":"sec-edgar","filing":"0001104659-17-061574","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1370483/000110465917061574/a4.xml","form_type":"4"}},{"id":4188767,"issuer":{"id":3693,"kind":"organization","name":"RHYTHM PHARMACEUTICALS, INC.","symbol":"RYTM"},"owners":[{"id":172587,"kind":"organization","name":"Ipsen, S.A.","position":1,"cik":"0001370483","reported_name":"Ipsen, S.A.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-10-10T16:22:25.000Z","date":"2017-10-10","kind":"exercise","acquired":true,"shares":45831,"ownership":{"direct":false,"nature":"The owner of record of the securities is Sutrepa SAS. 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