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Income Taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Balance at beginning of year | $ 88,433 | $ 66,435 | $ 44,321
Additions | 35,370 | 21,998 | 22,114
Deductions | 0 | 0 | 0
Balance at end of year | $ 123,803 | $ 88,433 | $ 66,435

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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Valuation allowance deferred tax asset additions. + References No definition available. + Details
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Balance Type: | credit
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- Definition Valuation allowance deferred tax asset deductions. + References No definition available. + Details
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Namespace Prefix: | irtc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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