XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.19.1

Cash Equivalents and Investments - Additional Information (Details) | 3 Months Ended
--- | ---
Mar. 31, 2019 Investment
Cash Equivalents And Investments [Abstract] |
Available-for-sale securities, weighted average days to maturity | 30 days
Number of unrealized loss position in investments | 1
Number of unrealized loss position for more than 12 months in investments | 0

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

X
- Definition Cash Equivalents and Investments. + References No definition available. + Details
Name: | irtc_CashEquivalentsAndInvestmentsAbstract
Namespace Prefix: | irtc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant