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Financial Statement Details - Rental Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Rental assets | $ 21,863 | $ 18,176
Less—accumulated depreciation | (15,754) | (12,791)
Rental assets, net | $ 6,109 | $ 5,385

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- Definition Accumulated Depreciation, Rental Assets + References No definition available. + Details
Name: | insg_AccumulatedDepreciationRentalAssets
Namespace Prefix: | insg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Rental Assets, Gross + References No definition available. + Details
Name: | insg_RentalAssetsGross
Namespace Prefix: | insg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rental Assets, Net + References No definition available. + Details
Name: | insg_RentalAssetsNet
Namespace Prefix: | insg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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