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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, 2017 | Dec. 31, 2016
Receivables [Abstract] |  |
Balance, beginning of period | $ 2,340 | $ 338
Add: contractual allowances | 4,072 | 2,726
Less: write-offs, net of recoveries and other adjustments | (678) | (724)
Balance, end of period | $ 5,734 | $ 2,340

X
- 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

X
- Definition Accounts receivable for contractual allowance write-offs, net of recoveries and other adjustments. + References No definition available. + Details
Name: | irtc_AccountsReceivableForContractualAllowanceWriteOffsNetOfRecoveriesAndOtherAdjustments
Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contractual allowance before adjustments. + References No definition available. + Details
Name: | irtc_ContractualAllowanceBeforeAdjustments
Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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