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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

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Namespace Prefix:	irtc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash Equivalents and Investments.

+ References

No definition available.

+ Details

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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

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