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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

X

- 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

X

- Details

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

X

- Details

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