Amount of accumulated accretion under last milestone and relative contingent consideration.

No definition available.

Name:	mass_AccumulatedAccretionAndRelativeContingentConsideration
Namespace Prefix:	mass_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of pension liability released and funds withheld paid.

+ References

No definition available.

+ Details

Name:	mass_BusinessCombinationContingentConsiderationPensionLiabilityReleased
Namespace Prefix:	mass_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents information pertaining to No. of milestones achieved

+ References

No definition available.

+ Details

Name:	mass_NumberOfMilestonesAchieved
Namespace Prefix:	mass_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents information pertaining to total number of milestones.

+ References

No definition available.

+ Details

Name:	mass_TotalNumberOfMilestones
Namespace Prefix:	mass_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479668/805-30-25-6

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph b
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479613/805-30-35-1

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow, not made soon after acquisition date of business combination, to settle contingent consideration liability up to amount recognized at acquisition date, including, but not limited to, measurement period adjustment and less amount paid soon after acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (f)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mass_Entity908DevicesGmbhMember
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Fair Value Measurements - Narratives (Details) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 29, 2024 USD ($)	Aug. 31, 2023 USD ($) Milestone	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 03, 2022 USD ($)
Fair Value Measurements
Current contingent consideration			$ 500	$ 500		$ 1,243
Contingent consideration, pension plan terminated and released					$ 900
Payments for contingent consideration				1,095
Accumulated accretion and relative contingent consideration			0
908 Devices GmbH
Fair Value Measurements
Contingent consideration, pension plan terminated and released			$ 900	$ 900	$ 900
Payments for contingent consideration		$ 500
908 Devices GmbH \| Subsequent event
Fair Value Measurements
Payments for contingent consideration	$ 500
908 Devices GmbH \| Share Purchase and Transfer Agreement Contingent Consideration
Fair Value Measurements
Number Of Milestones Achieved \| Milestone		2
Total Number Of Milestones \| Milestone		3
Payments for contingent consideration		$ 500
908 Devices GmbH \| Share Purchase and Transfer Agreement Contingent Consideration \| Subsequent event
Fair Value Measurements
Payments for contingent consideration	$ 500
908 Devices GmbH
Fair Value Measurements
Contingent consideration							$ 2,000