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Summary of Significant Accounting Policies - Allowance for Credit Loss (Details) $ in Thousands | 12 Months Ended
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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

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- Definition Contract With Customer, Asset, Allowance For Current Period Sales + References No definition available. + Details
Name: | insm_ContractWithCustomerAssetAllowanceForCurrentPeriodSales
Namespace Prefix: | insm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- 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

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- Details
Name: | srt_MajorCustomersAxis=insm_CustomerFeesDiscountsandOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_MajorCustomersAxis=insm_RebatesChargebacksandCoPayAssistanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |