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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - Warrants Issued and Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2016
--- | --- | ---
Class of Warrant or Right |  |
Warrants issued (shares) | 430,080 | 430,080
Warrants outstanding (shares) | 430,080 |
Fair value of warrants outstanding | $ 89 |
September 2013 |  |
Class of Warrant or Right |  |
Warrants issued (shares) | 150,000 |
Warrants outstanding (shares) | 150,000 |
Fair value of warrants outstanding | $ 10 |
October 2013 |  |
Class of Warrant or Right |  |
Warrants issued (shares) | 150,000 |
Warrants outstanding (shares) | 150,000 |
Fair value of warrants outstanding | $ 10 |
December 2016 |  |
Class of Warrant or Right |  |
Warrants issued (shares) | 130,080 |
Warrants outstanding (shares) | 130,080 |
Fair value of warrants outstanding | $ 69 |

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- Definition Class Of Warrant Or Right, Issued + References No definition available. + Details
Name: | exfy_ClassOfWarrantOrRightIssued
Namespace Prefix: | exfy_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=exfy_September2013WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=exfy_October2013WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=exfy_December2016WarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |