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Operating Segments - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenue from external customers |  | $ 30,172 |  | $ 22,535 |  | $ 77,079 |  | $ 51,378 |
Intercompany revenues |  |  |  |  |  |  |  |  |
Gross profit |  | 4,750 |  | 5,157 |  | 12,700 |  | 10,929 |
Research and development |  | 157 |  | 165 |  | 598 |  | 615 |
Interest income |  | 28 |  | 77 |  | 112 |  | 265 |
Interest expense |  | (87) |  | (99) |  | (306) |  | (293) |
Interest expense-financing fees |  | (58) |  | (69) |  | (187) |  | (139) |
Depreciation and amortization |  | 478 |  | 328 |  | 1,189 |  | 968 |
Segment income (loss) before income taxes |  | 1,348 |  | 1,950 |  | 2,921 |  | 1,818 |
Income tax (benefit) expense |  | (133) |  | 55 |  | (128) |  | 99 |
Segment income (loss) |  | 1,481 |  | 1,895 |  | 3,049 |  | 1,719 |
Expenditures for segment assets |  | 122 | [1] | 501 | [2] | 1,488 | [1] | 813 | [2]
Treatment [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 7,066 |  | 10,081 |  | 24,469 |  | 30,079 |
Intercompany revenues |  | 226 |  | 75 |  | 879 |  | 83 |
Gross profit |  | 1,094 |  | 3,338 |  | 5,533 |  | 8,921 |
Research and development |  | 49 |  | 85 |  | 194 |  | 367 |
Interest income |  |  |  |  |  | 1 |  |  |
Interest expense |  | (34) |  | (19) |  | (80) |  | (66) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 373 |  | 243 |  | 912 |  | 713 |
Segment income (loss) before income taxes |  | 280 |  | 2,244 |  | 2,577 |  | 5,731 |
Income tax (benefit) expense |  | (170) |  | 55 |  | (165) |  | 99 |
Segment income (loss) |  | 450 |  | 2,189 |  | 2,742 |  | 5,632 |
Expenditures for segment assets |  | 95 |  | 470 |  | 1,095 |  | 764 |
Services [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 23,106 |  | 12,454 |  | 52,610 |  | 21,299 |
Intercompany revenues |  | 6 |  | 38 |  | 19 |  | 101 |
Gross profit |  | 3,656 |  | 1,819 |  | 7,167 |  | 2,008 |
Research and development |  | 7 |  |  |  | 119 |  |  |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  | (3) |  | (5) |  | (13) |  | (18) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 97 |  | 79 |  | 259 |  | 236 |
Segment income (loss) before income taxes |  | 2,813 |  | 1,193 |  | 5,162 |  | 318 |
Income tax (benefit) expense |  | 2 |  |  |  | 2 |  |  |
Segment income (loss) |  | 2,811 |  | 1,193 |  | 5,160 |  | 318 |
Expenditures for segment assets |  | 24 |  | 31 |  | 385 |  | 49 |
Medical [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  |
Intercompany revenues |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |
Research and development |  | 81 |  | 74 |  | 221 |  | 228 |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |
Segment income (loss) before income taxes |  | (81) |  | (74) |  | (221) |  | (228) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |
Segment income (loss) |  | (81) |  | (74) |  | (221) |  | (228) |
Expenditures for segment assets |  |  |  |  |  |  |  |  |
Segments Total [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 30,172 |  | 22,535 |  | 77,079 |  | 51,378 |
Intercompany revenues |  | 232 |  | 113 |  | 898 |  | 184 |
Gross profit |  | 4,750 |  | 5,157 |  | 12,700 |  | 10,929 |
Research and development |  | 137 |  | 159 |  | 534 |  | 595 |
Interest income |  |  |  |  |  | 1 |  |  |
Interest expense |  | (37) |  | (24) |  | (93) |  | (84) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 470 |  | 322 |  | 1,171 |  | 949 |
Segment income (loss) before income taxes |  | 3,012 |  | 3,363 |  | 7,518 |  | 5,821 |
Income tax (benefit) expense |  | (168) |  | 55 |  | (163) |  | 99 |
Segment income (loss) |  | 3,180 |  | 3,308 |  | 7,681 |  | 5,722 |
Expenditures for segment assets |  | 119 |  | 501 |  | 1,480 |  | 813 |
Corporate [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers | [3] |  |  |  |  |  |  |  |
Intercompany revenues | [3] |  |  |  |  |  |  |  |
Gross profit | [3] |  |  |  |  |  |  |  |
Research and development | [3] | 20 |  | 6 |  | 64 |  | 20 |
Interest income | [3] | 28 |  | 77 |  | 111 |  | 265 |
Interest expense | [3] | (50) |  | (75) |  | (213) |  | (209) |
Interest expense-financing fees | [3] | (58) |  | (69) |  | (187) |  | (139) |
Depreciation and amortization | [3] | 8 |  | 6 |  | 18 |  | 19 |
Segment income (loss) before income taxes | [3] | (1,664) |  | (1,413) |  | (4,597) |  | (4,003) |
Income tax (benefit) expense | [3] | 35 |  |  |  | 35 |  |  |
Segment income (loss) | [3] | (1,699) |  | (1,413) |  | (4,632) |  | (4,003) |
Expenditures for segment assets | [3] | $ 3 |  |  |  | $ 8 |  |  |
[1] | Net of financed amount of $751,000 and $883,000 for the three and nine months ended September 30, 2020, respectively.
[2] | Net of financed amount of $6,000 and $29,000 for the three and nine months ended September 30, 2019, respectively.
[3] | Amounts reflect the activity for corporate headquarters not included in the segment information.

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