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Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue from external customers |  | $ 105,426 | $ 73,459
Intercompany revenues |  |  |
Gross profit |  | 15,893 | 15,584
Research and development |  | 762 | 750
Interest income |  | 140 | 337
Interest expense |  | (398) | (432)
Interest expense-financing fees |  | (294) | (208)
Depreciation and amortization |  | 1,596 | 1,342
Segment income (loss) before income taxes |  | 2,960 | 2,889
Income tax (benefit) expense |  | (189) | 157
Segment income (loss) |  | 3,149 | 2,732
Segment assets | [1] | 78,919 | 66,515
Expenditures for segment assets (net) | [2] | 1,715 | 1,535
Total debt | [3] | 6,729 | 3,880
Treatment [Member] |  |  |
Revenue from external customers |  | 30,143 | 40,364
Intercompany revenues |  | 1,493 | 329
Gross profit |  | 5,491 | 12,248
Research and development |  | 243 | 401
Interest income |  | 1 |
Interest expense |  | (115) | (129)
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 1,204 | 999
Segment income (loss) before income taxes |  | 1,494 | 7,973
Income tax (benefit) expense |  | (264) | 153
Segment income (loss) |  | 1,758 | 7,820
Segment assets | [1] | 32,324 | 34,260
Expenditures for segment assets (net) |  | 1,264 | 1,366
Total debt |  |  |
Services [Member] |  |  |
Revenue from external customers |  | 75,283 | 33,095
Intercompany revenues |  | 25 | 38
Gross profit |  | 10,402 | 3,336
Research and development |  | 132 | 12
Interest income |  |  |
Interest expense |  | (27) | (23)
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 354 | 318
Segment income (loss) before income taxes |  | 7,826 | 795
Income tax (benefit) expense |  | 6 |
Segment income (loss) |  | 7,820 | 795
Segment assets | [1],[4] | 22,368 | 15,410
Expenditures for segment assets (net) |  | 451 | 169
Total debt |  | 23 |
Medical [Member] |  |  |
Revenue from external customers |  |  |
Intercompany revenues |  |  |
Gross profit |  |  |
Research and development |  | 311 | 314
Interest income |  |  |
Interest expense |  |  |
Interest expense-financing fees |  |  |
Depreciation and amortization |  |  |
Segment income (loss) before income taxes |  | (311) | (314)
Income tax (benefit) expense |  |  |
Segment income (loss) |  | (311) | (314)
Segment assets | [1] | 17 | 16
Expenditures for segment assets (net) |  |  |
Total debt |  |  |
Segments Total [Member] |  |  |
Revenue from external customers | [5],[6] | 105,426 | 73,459
Intercompany revenues |  | 1,518 | 367
Gross profit |  | 15,893 | 15,584
Research and development |  | 686 | 727
Interest income |  | 1 |
Interest expense |  | (142) | (152)
Interest expense-financing fees |  |  |
Depreciation and amortization |  | 1,558 | 1,317
Segment income (loss) before income taxes |  | 9,009 | 8,454
Income tax (benefit) expense |  | (258) | 153
Segment income (loss) |  | 9,267 | 8,301
Segment assets | [1] | 54,709 | 49,686
Expenditures for segment assets (net) |  | 1,715 | 1,535
Total debt |  | 23 |
Corporate [Member] |  |  |
Revenue from external customers | [7] |  |
Intercompany revenues | [7] |  |
Gross profit | [7] |  |
Research and development | [7] | 76 | 23
Interest income | [7] | 139 | 337
Interest expense | [7] | (256) | (280)
Interest expense-financing fees | [7] | (294) | (208)
Depreciation and amortization | [7] | 38 | 25
Segment income (loss) before income taxes | [7] | (6,049) | (5,565)
Income tax (benefit) expense | [7] | 69 | 4
Segment income (loss) | [7] | (6,118) | (5,569)
Segment assets | [1],[7],[8] | 24,210 | 16,829
Expenditures for segment assets (net) | [7] |  |
Total debt | [7] | $ 6,706 | $ 3,880
[1] | Segment assets have been adjusted for intercompany accounts to reflect actual assets for each segment.
[2] | Net of financed amount of $883,000 and $393,000 for the year ended December 31, 2020 and 2019, respectively.
[3] | Net of debt discount/debt issuance costs of ($105,000) and ($340,000) for 2020 and 2019, respectively (see "Note 10 - Long-Term Debt" for additional information).
[4] | Includes long-lived asset (net) for our PF Canada, Inc. subsidiary of $33,000 and $41,000 for the year ended December 31, 2020 and 2019, respectively.
[5] | The Company performed services relating to waste generated by government clients (domestic and foreign (primarily Canadian)), either directly as a prime contractor or indirectly for others as a subcontractor to government entities, representing approximately 96,582,000 or 91.6% of total revenue for 2020 and $59,985,000 or 81.7% of total revenue for 2019. The following reflects such revenue generated by our two segments: 2020 Domestic government Treatment 22,795 Foreign government Treatment 415 Total 23,210 Domestic government Services 68,237 Foreign government Services 5,135 Total 73,372 Total 91,032 5,550 96,582 2019 Domestic government Treatment 29,420 Foreign government Treatment 279 Total 29,699 Domestic government Services 25,077 Foreign government Services 5,209 Total Services 30,286 Total 54,497 5,488 59,985
[6] | The following table reflects revenue based on customer location: 2020 United States 99,790 Canada 5,550 United Kingdom 86 Total 105,426 2019 United States 67,822 Canada 5,488 United Kingdom 149 Total 73,459
[7] | Amounts reflect the activity for corporate headquarters not included in the segment information.
[8] | Amount includes assets from our discontinued operations of $103,000 and $221,000 at December 31, 2020 and 2019, respectively.

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