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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Changes in Contractual Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Contract with Customer, Asset, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of year | $ 31,274 | $ 21,281 | $ 15,433
Add: allowance for contractual adjustments | 41,158 | 27,459 | 20,916
Less: contractual adjustments | (31,043) | (17,466) | (15,068)
Balance, end of year | $ 41,389 | $ 31,274 | $ 21,281

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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