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Summary of Significant Accounting Policies - Allowance for Credit Loss (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]
Balance at beginning	$ 0
Allowances for current period sales	1,184
Payments and credits	(262)
Ending balance	922
Customer Fees, Discounts and Other
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]
Balance at beginning	0
Allowances for current period sales	335
Payments and credits	(101)
Ending balance	234
Rebates, Chargebacks, and Co-Pay Assistance
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]
Balance at beginning	0
Allowances for current period sales	849
Payments and credits	(161)
Ending balance	$ 688

X

- Definition

Contract With Customer, Asset, Allowance For Current Period Sales

+ References

No definition available.

+ Details

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

X

- Definition

Contract With Customer, Assets, Allowance For Credit Loss, Payments and Credits

+ References

No definition available.

+ Details

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

X

- Definition

Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward]

+ References

No definition available.

+ Details

Name:	insm_ContractwithCustomerAssetAllowanceforCreditLossRollForward
Namespace Prefix:	insm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of accumulated credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

+ Details

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

X

- Details

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

X

- Details

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