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Balance Sheet Components - Components of Inventory and Printed Circuit Board Assemblies ("PCBAs") (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | $ 5,313 | $ 4,037
Raw materials |  |
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | 2,469 | 1,574
Finished goods |  |
Inventory [Line Items] |  |
Total inventory and printed circuit board assemblies | $ 2,844 | $ 2,463

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- Definition Inventory and printed circuit board assemblies. + References No definition available. + Details
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Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=irtc_RawMaterialsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=irtc_FinishedGoodsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |