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Unaudited Condensed Statements of Stockholders' Equity (Parenthetical) $ in Thousands	Mar. 31, 2021 USD ($)
Statement of Financial Position [Abstract]
Stock issuance costs	$ 4,435

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- Definition

Stock Issuance Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	exdx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_StatementOfFinancialPositionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration