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Warrants to Purchase Common or Preferred Stock - Narrative (Details) - shares | 1 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2017
Temporary Equity [Line Items] |  |
Number of common shares called upon exercise of warrants | 512,363 |
Number of warrants exercised | 569,184 |
Number of warrants unexercised and terminated | 9,054 |
Series F redeemable convertible preferred stock |  |
Temporary Equity [Line Items] |  |
Number of common shares called upon exercise of warrants |  | 104,722
Series D and Series E redeemable convertible preferred stock |  |
Temporary Equity [Line Items] |  |
Number of common shares called upon exercise of warrants | 119,771 |
Net exercise of common stock warrants (in shares) | 27,431 |

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- Definition Class of Warrant or Right, Exercised + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Class of Warrant or Right, Unexercised and Terminated + References No definition available. + Details
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Namespace Prefix: | exdx_
Data Type: | xbrli:sharesItemType
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- Definition Stock Issued During Period, Shares, Warrants Exercised, Net + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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