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Debt (Narrative) (Details) |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 27, 2018 USD ($) | Jan. 30, 2018 USD ($) Installment | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 | Dec. 31, 2003 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Street Capital Loan, Description |  |  |  |  |  |  | In 2014, following Street Capital’s distribution of its ownership interest in HGI to Street Capital stockholders as a dividend in kind, the unpaid balance of the Street Capital Loan began accruing interest at a rate per annum equal to the lesser of the Wall St. Journal (“WSJ”) prime rate + 2.0%, or the maximum rate allowable by law. As of December 31, 2015, the interest rate on the loan was 5.50%. In the third quarter of 2016, following an amendment to the loan agreement, the Street Capital Loan began accruing interest at a rate per annum equal to the WSJ prime rate + 1.0%. The Company also agreed to a monthly payment schedule to begin in the third quarter of 2016, and Street Capital removed the security from the Company’s assets. As of December 31, 2017, the interest rate on the loan was 5.50%. |  |  |
Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  |  | $ 750,000 |  |
Monthly interest payment |  |  |  |  |  |  |  | $ 4,000 |  |
Line of credit, outstanding amount period |  |  |  |  |  |  | 1 month |  |  |
Affiliated Entity [Member] | Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit aggregate borrowing capacity |  |  |  | $ 1,500,000 |  |  |  |  |  |
Interest rate description |  |  |  |  |  |  | Aggregate loans under the Line of Credit up to $1.0 million incur interest at a variable rate per annum based on the rate charged to the Entity by its bank, plus 2.0%. Amounts outstanding at any time in excess of $1.0 million incur interest at a rate of 8.0% per annum. |  |  |
Line of credit, annual commitment fee |  |  |  | $ 15,000 |  |  |  |  |  |
Line of credit, commitment fee payment description |  |  |  |  |  |  | monthly basis |  |  |
Maturity description |  |  |  |  |  |  | The Line of Credit matures at the earlier of (i) three years from the date of the Agreement, (ii) the termination of the Entity’s line of credit with its bank, or (iii) forty-five (45) days following the date the Company closes a new credit facility with a financial institution. During 2017, the Company borrowed $750,000 on the Line of Credit and made one repayment of the full amount, including approximately $4,000 of interest. The total amount was outstanding for a one month period. |  |  |
Expense incurred based on profit share provision for principle and guarantee transaction |  |  |  |  |  |  | $ 179,000 |  |  |
Heritage Global LLC [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount paid behalf of subsidiary |  | $ 1,260,000 |  |  |  |  |  |  |  |
Number of installments | Installment |  | 36 |  |  |  |  |  |  |  |
Litigation settlement installments amount due |  | $ 35,000 |  |  |  |  |  |  |  |
Remaining outstanding debt balance payable date |  | Jan. 30, 2021 |  |  |  |  |  |  |  |
Interest rate on promissory note |  |  |  |  |  |  |  | 6.50% |  |
Percentage of default interest amount |  |  |  |  |  |  | 12.00% |  |  |
Description of event of default |  |  |  |  |  |  | An “Event of Default” means: (a) any failure of HG LLC to pay when due any amount thereunder, when and as due, (b) any failure on the part of HG LLC to pay upon 54 Finance’s demand any fees, costs, expenses or other charges hereunder or otherwise due to HG LLC under the Note or the Guaranty, (c) any breach, failure or default under the Guaranty, (d) HG LLC or HGI repudiates or revokes, or purports to repudiate or revoke, any obligation under the Note or the Guaranty, or the obligation of HGI under the Guaranty is limited or terminated by operation of law or by HGI, or (e) HG LLC or HGI are insolvent or admit in writing its inability to pay debts as they mature, or make a general assignment for the benefit of its creditors, or institute any bankruptcy, insolvency or similar proceeding under the laws of any jurisdiction, or take any action to authorize such proceeding. |  |  |
Debt instrument, periodic payment |  |  |  |  |  |  | $ 385,000 |  |  |
Outstanding note balance |  |  | $ 816,000 |  |  |  | 816,000 |  |  |
Street Capital Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Related party loan, Interest rate |  |  |  |  |  | 10.00% |  | 5.50% | 5.50% |
First Choice Bank [Member] | Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit | $ 1,500,000 |  | 1,300,000 |  |  |  | $ 1,300,000 |  |  |
Debt instrument, Maturity date |  |  |  |  |  |  | Oct. 05, 2019 |  |  |
Frequency of payment |  |  |  |  |  |  | monthly payments |  |  |
Line of credit, repayment |  |  | 500,000 |  |  |  |  |  |  |
Line of credit, remaining borrowing capacity |  |  | $ 800,000 |  |  |  | $ 800,000 |  |  |
First Choice Bank [Member] | Revolving Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Monthly interest payment | $ 100 |  |  |  |  |  |  |  |  |
Bank Plus 2.0% [Member] | Affiliated Entity [Member] | Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  |  |  | 2.00% |  |  |  |  |  |
Line of credit |  |  |  | $ 1,000,000 |  |  |  |  |  |
8.0% Interest Rate [Member] | Affiliated Entity [Member] | Revolving Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Related party loan, Interest rate |  |  |  | 8.00% |  |  |  |  |  |
Line of credit |  |  |  | $ 1,000,000 |  |  |  |  |  |
Wall Street Journal prime rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  |  |  |  | 1.00% |  |  |  |  | 2.00%
Wall Street Journal prime rate [Member] | First Choice Bank [Member] | Revolving Line of Credit [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate per annum | 5.25% |  |  |  |  |  |  |  |  |

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