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Leases - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Lease cost, future right-of-use asset	$ 49.1
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years 10 months

X

- Definition

Lease, Remaining Lease Term

+ References

No definition available.

+ Details

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Namespace Prefix:	insm_
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Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Operating Lease, Lease Not yet Commenced, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	insm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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