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The RSUs have no expiration date."}],"balance_after":15082,"derivative":{"underlying":"Common Stock","underlying_shares":5027},"source":{"system":"sec-edgar","filing":"0001562180-23-000965","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023000965/primarydocument.xml","form_type":"4"}},{"id":2032205,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock","published_at":"2023-02-03T22:14:03.000Z","date":"2023-02-02","kind":"sale","acquired":false,"shares":10000,"price":10.03,"value":100300.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F4","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.00 to $10.19, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":902375,"source":{"system":"sec-edgar","filing":"0001562180-23-000965","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218023000965/primarydocument.xml","form_type":"4"}},{"id":2032204,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock","published_at":"2023-02-03T22:14:03.000Z","date":"2023-02-01","kind":"sale","acquired":false,"shares":1564,"price":9.17,"value":14341.88,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sale reported on this Form 4 represents shares sold by the reporting person to cover tax withholding obligations in connection with the vesting and settlement of RSUs. The sale is mandated by the issuer's election to require the satisfaction of tax withholding obligations to be funded by a \"sell to cover\" transaction and does not represent a discretionary transaction by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.98 to $9.69, inclusive. 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The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":908912,"source":{"system":"sec-edgar","filing":"0001562180-22-006654","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022006654/primarydocument.xml","form_type":"4"}},{"id":2209650,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-07-08T20:37:15.000Z","date":"2022-07-06","kind":"sale","acquired":false,"shares":3200,"price":21.78,"value":69696.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":928912,"source":{"system":"sec-edgar","filing":"0001562180-22-005632","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022005632/primarydocument.xml","form_type":"4"}},{"id":2209649,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-07-08T20:37:15.000Z","date":"2022-07-06","kind":"sale","acquired":false,"shares":6800,"price":21.04,"value":143072.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.60 to $21.58, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":932112,"source":{"system":"sec-edgar","filing":"0001562180-22-005632","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022005632/primarydocument.xml","form_type":"4"}},{"id":2216766,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-07-01T20:10:03.000Z","date":"2022-06-30","kind":"sale","acquired":false,"shares":3700,"price":20.12,"value":74444.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.19, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":938912,"source":{"system":"sec-edgar","filing":"0001562180-22-005442","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022005442/primarydocument.xml","form_type":"4"}},{"id":2216765,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-07-01T20:10:03.000Z","date":"2022-06-29","kind":"sale","acquired":false,"shares":16471,"price":20.22,"value":333043.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.59, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":942612,"source":{"system":"sec-edgar","filing":"0001562180-22-005442","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022005442/primarydocument.xml","form_type":"4"}},{"id":2296794,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-04-14T20:20:36.000Z","date":"2022-04-12","kind":"sale","acquired":false,"shares":9829,"price":20.06,"value":197169.74,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.20, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":959083,"source":{"system":"sec-edgar","filing":"0001562180-22-003399","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022003399/primarydocument.xml","form_type":"4"}},{"id":2322810,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-03-21T20:39:37.000Z","date":"2022-03-18","kind":"sale","acquired":false,"shares":19900,"price":20.06,"value":399194.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.28, inclusive. 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The RSUs have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs shall vest 25% on March 1, 2023, with the remaining 75% vesting in three substantially equal annual installments at the three anniversary dates following March 1, 2023, subject to the reporting person's continued service through the applicable vesting date. The RSUs have no expiration date."}],"balance_after":20109,"derivative":{"underlying":"Common Stock, par value $0.001","underlying_shares":20109},"source":{"system":"sec-edgar","filing":"0001562180-22-002266","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022002266/primarydocument.xml","form_type":"4"}},{"id":2352915,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Stock Option (option to buy)","published_at":"2022-03-03T21:34:20.000Z","date":"2022-03-01","kind":"grant","acquired":true,"shares":33400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Twenty-five percent of the shares underlying the option become vested and exercisable on March 1, 2023, and the remaining 75% of the shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following March 1, 2023, subject to the reporting person's continued service through the applicable vesting date."}],"balance_after":33400,"derivative":{"exercise_price":16.66,"expiration_date":"2032-03-01","underlying":"Common Stock, par value $0.001","underlying_shares":33400},"source":{"system":"sec-edgar","filing":"0001562180-22-002266","document":"primarydocument.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022002266/primarydocument.xml","form_type":"4"}},{"id":2439740,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-01-07T21:09:05.000Z","date":"2022-01-05","kind":"sale","acquired":false,"shares":6714,"price":24.05,"value":161471.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.67 to $24.50, inclusive. The reporting person undertakes to provide to 908 Devices Inc., any security holder of 908 Devices Inc., 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 ranges set forth in this footnote."}],"balance_after":988912,"source":{"system":"sec-edgar","filing":"0001562180-22-000335","document":"primarydocument.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1555279/000156218022000335/primarydocument.xml","form_type":"4"}},{"id":2439739,"issuer":{"id":5564,"kind":"organization","name":"908 Devices Inc.","symbol":"MASS"},"owners":[{"id":10078,"kind":"person","name":"Brown Christopher D.","position":1,"cik":"0001836988","reported_name":"Brown Christopher D.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.001","published_at":"2022-01-07T21:09:05.000Z","date":"2022-01-05","kind":"sale","acquired":false,"shares":3286,"price":22.89,"value":75216.54,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents sales effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.63 to $23.59, inclusive. 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