XML 46 R35.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Cash Equivalents and Investments - Additional Information (Details) | 9 Months Ended
--- | ---
Sep. 30, 2017
Cash And Cash Equivalents [Abstract] |
Available-for-sale securities, weighted average days to maturity | 122 days

X
- Definition Available-for-sale securities maturity period. + References No definition available. + Details
Name: | irtc_AvailableForSaleSecuritiesMaturityPeriod
Namespace Prefix: | irtc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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