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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Commercial building lease agreement entered date |  |  | 2017-05 |
Commercial building lease agreement expiration date |  |  | 2027-09 |
Rent Expense | $ 1.3 | $ 0.6 | $ 3.8 | $ 1.6

X
- Definition Lease agreement entered month and year. + References No definition available. + Details
Name: | irtc_LeaseAgreementEnteredMonthAndYear
Namespace Prefix: | irtc_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease agreement expiration month and year. + References No definition available. + Details
Name: | irtc_LeaseAgreementExpirationMonthAndYear
Namespace Prefix: | irtc_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration