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Summary of Significant Accounting Policies (Details Narrative) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 02, 2019 | Oct. 02, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | May 24, 2019 | Jan. 02, 2019 | Jan. 02, 2018
Cash on hand |  |  | $ 390 | $ 810 |  |  |
Finite risk sinking fund |  |  | $ 11,307 | 15,971 |  |  |
Percentage of reserves for doubtful accounts receivable |  |  | 100.00% |  |  |  |
Finance leases assets recorded |  |  | $ 1,410 | 517 |  |  |
Finance leases accumulated depreciation |  |  | 71 | 8 |  |  |
Finance leases net fixed asset |  |  | 1,339 | 509 |  |  |
Depreciation |  |  | 1,086 | 1,105 |  |  |
Impairment charges |  |  |  |  |  |  |
Definite-lived permit |  |  |  | 7 |  |  |
Research and development expense |  |  | 750 | 1,370 |  |  |
Net revenues |  |  | 73,459 | 49,539 |  |  |
Increase in accumulated deficit |  |  |  |  |  |  | $ 316
Right of use asset |  |  | 2,545 |  |  | $ 2,602 |
Operating lease liabilities |  |  | 2,586 |  |  | $ 2,622 |
Government Clients [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Net revenues |  |  | $ 59,985 | $ 35,944 |  |  |
Concentration risk percentage |  |  | 81.70% | 72.60% |  |  |
Customer One [Member] | Unbilled and Accounts Receivables [Member] |  |  |  |  |  |  |
Concentration risk percentage |  |  | 12.50% | 10.70% |  |  |
Customer Two [Member] | Unbilled and Accounts Receivables [Member] |  |  |  |  |  |  |
Concentration risk percentage |  |  | 34.30% | 10.50% |  |  |
Medical Segment [Member] |  |  |  |  |  |  |
Research and development expense |  |  | $ 314 | $ 811 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 9.00% |  |  |  |
Minimum [Member] | Treatment/ Processing [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 15.00% |  |  |  |
Minimum [Member] | Shipment/ Final Disposal [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 9.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 33.00% |  |  |  |
Maximum [Member] | Treatment/ Processing [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 79.00% |  |  |  |
Maximum [Member] | Shipment/ Final Disposal [Member] |  |  |  |  |  |  |
Receipt ranging percentage |  |  | 52.00% |  |  |  |
Building [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 10 years |  |  |  |
Building [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 40 years |  |  |  |
Office Furniture And Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 3 years |  |  |  |
Office Furniture And Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Property, plant and equipment, useful life |  |  | 7 years |  |  |  |
Office/Warehouse Spaces [Member] | Minimum [Member] |  |  |  |  |  |  |
Operating lease term |  |  | 4 years |  |  |  |
Operating lease renewal term |  |  | 3 years |  |  |  |
Office/Warehouse Spaces [Member] | Maximum [Member] |  |  |  |  |  |  |
Operating lease term |  |  | 10 years |  |  |  |
Operating lease renewal term |  |  | 8 years |  |  |  |
Processing and Lab Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Finance lease term |  |  | 2 years |  |  |  |
Processing and Lab Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Finance lease term |  |  | 3 years |  |  |  |
Engineering/Remediation Resources Group, Inc [Member] |  |  |  |  |  |  |
Partnership interest |  |  |  |  | 49.00% |  |
Perma-Fix [Member] |  |  |  |  |  |  |
Partnership interest |  |  |  |  | 51.00% |  |
Foreign Subsidiaries [Member] |  |  |  |  |  |  |
Cash on hand |  |  | $ 388 | $ 806 |  |  |

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