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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Changes in Contractual Allowance (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Changes In The Contractual Allowance |  |  |
Balance, beginning of period | $ 41,389 | $ 31,274 | $ 31,274
Add: provision for contractual adjustments | 39,060 | 31,534 | 41,158
Less: contractual adjustments | (32,072) | (259) | (31,043)
Balance, end of period | $ 48,377 | $ 62,549 | $ 41,389

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- Definition Accounts receivable allowance for contractual adjustments. + References No definition available. + Details
Name: | irtc_AccountsReceivableAllowanceForContractualAdjustments
Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accounts receivable contractual adjustments. + References No definition available. + Details
Name: | irtc_AccountsReceivableContractualAdjustments
Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Accounts receivable for contractual allowance. + References No definition available. + Details
Name: | irtc_AccountsReceivableForContractualAllowance
Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ContractWithCustomerAssetAllowanceForCreditLossRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration