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 contingent pension liabilities assumed by the acquirer as part of consideration transferred in a business combination.

+ References

No definition available.

+ Details

Name:	mass_BusinessCombinationContingentConsiderationPensionLiabilityAssumed
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

The number of milestone based earnout payments in business combination.

+ References

No definition available.

+ Details

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

- Definition

The number of milestone based earnout payments achieved in business combination.

+ References

No definition available.

+ Details

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

- Definition

Number of parties with royalty arrangements.

+ References

No definition available.

+ Details

Name:	mass_NumberOfPartiesWithRoyaltyArrangements
Namespace Prefix:	mass_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Related to royalty arrangements.

+ References

No definition available.

+ Details

Name:	mass_RoyaltyArrangementsAbstract
Namespace Prefix:	mass_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of royalty liability payments due annually.

+ References

No definition available.

+ Details

Name:	mass_RoyaltyLiabilitiesFutureMinimumRoyaltyPaymentsAnnual
Namespace Prefix:	mass_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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

- 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

Name:	us-gaap_LongTermPurchaseCommitmentLineItems
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

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

- Details

Name:	srt_ConsolidatedEntitiesAxis=mass_Entity908DevicesGmbhMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mass_Entity908DevicesGmbhMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies (Details) $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
Commitments and Contingencies (Details) $ in Thousands	Aug. 03, 2022 USD ($) Milestone	Feb. 29, 2024 USD ($)	Aug. 31, 2023 USD ($) Milestone	Dec. 31, 2023 USD ($) item	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)	Apr. 30, 2023 USD ($)
Commitments and Contingencies
Contingent consideration, pension plan terminated and released							$ 900
Payments for contingent consideration					$ 1,095
Accumulated accretion and relative contingent consideration				$ 0
Royalty Arrangements
Number of parties with royalty arrangements \| item				2	2
Future minimum annual royalty payments				$ 100	$ 100
401(k) Savings Plan
Employer contributions to defined contribution plan					500	$ 500
908 Devices GmbH
Commitments and Contingencies
Number of milestone based earnouts under Trace purchase agreement \| Milestone	3		3
Contingent consideration - pension liability	$ 900
Contingent consideration, pension plan terminated and released				$ 900	$ 900		$ 900
Number of milestone based earnouts payment achieved under Trace purchase agreement \| Milestone			2
Payments for contingent consideration			$ 500
908 Devices GmbH
Commitments and Contingencies
Contingent consideration	2,000
Contingent consideration - pension liability	$ 900
Subsequent event \| 908 Devices GmbH
Commitments and Contingencies
Payments for contingent consideration		$ 500