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Leases (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) Location | Dec. 31, 2019 USD ($) | Jan. 01, 2019
Lessee Lease Description [Line Items] |  |  |
Number of locations | Location | 3 |  |
Lessee operating lease, incremental borrowing rate |  |  | 5.25%
Lease expense | $ | $ 0.6 | $ 0.5 |
Burlingame, CA [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease termination date | Apr. 30, 2021 |  |
Hayward, CA [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Warehouse lease, effective date | May 01, 2021 |  |

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- Definition Leases effective date. + References No definition available. + Details
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Namespace Prefix: | hgbl_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee operating lease, incremental borrowing rate. + References No definition available. + Details
Name: | hgbl_LesseeOperatingLeaseIncrementalBorrowingRate
Namespace Prefix: | hgbl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of locations. + References No definition available. + Details
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Namespace Prefix: | hgbl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |