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Product Revenues, Net - Nerrative (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2022 USD ($)
Revenue from Contract with Customer [Abstract] |
Revenue reversal due to agreement | $ 5.8

X
- Definition Revenue Reversal Due To Agreement + References No definition available. + Details
Name: | insm_RevenueReversalDueToAgreement
Namespace Prefix: | insm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration