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Operating Segments - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue from external customers |  | $ 11,984 |  | $ 11,758 |  | $ 37,801 |  | $ 37,179 |
Intercompany revenues |  |  |  |  |  |  |  |  |
Gross profit |  | 1,825 |  | 1,745 |  | 7,189 |  | 6,817 |
Research and development |  | 229 |  | 293 |  | 680 |  | 1,300 |
Interest income |  | 82 |  | 34 |  | 212 |  | 105 |
Interest expense |  | (62) |  | (59) |  | (177) |  | (249) |
Interest expense-financing fees |  | (10) |  | (9) |  | (27) |  | (27) |
Depreciation and amortization |  | 364 |  | 1,107 |  | 1,095 |  | 3,394 |
Segment income (loss) before income taxes |  | (1,025) |  | (1,906) |  | 86 |  | (3,660) |
Income tax (benefit) expense |  | (1,342) |  | 71 |  | (1,272) |  | 218 |
Segment income (loss) |  | 317 |  | (1,977) |  | 1,358 |  | (3,878) |
Expenditures for segment assets |  | 548 |  | 84 |  | 1,102 |  | 200 |
Treatment [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 9,103 |  | 9,355 |  | 27,207 |  | 29,019 |
Intercompany revenues |  | 174 |  | 77 |  | 463 |  | 191 |
Gross profit |  | 1,564 |  | 1,613 |  | 5,867 |  | 6,474 |
Research and development |  | 126 |  | 96 |  | 355 |  | 339 |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  | (8) |  | (1) |  | (16) |  | (27) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 234 |  | 964 |  | 702 |  | 2,960 |
Segment income (loss) before income taxes |  | 506 |  | 40 | [1] | 4,279 | [2] | 2,880 | [1]
Income tax (benefit) expense |  | (1,342) | [3] | 70 |  | (1,277) | [3] | (215) |
Segment income (loss) |  | 1,848 |  | (30) |  | 5,556 |  | 2,665 |
Expenditures for segment assets |  | 525 |  | 81 |  | 1,016 |  | 188 |
Services [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 2,881 |  | 2,403 |  | 10,594 |  | 8,160 |
Intercompany revenues |  | 16 |  | 10 |  | 55 |  | 21 |
Gross profit |  | 261 |  | 132 |  | 1,322 |  | 343 |
Research and development |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  | (1) |  | (1) |  | (2) |  | (2) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 122 |  | 134 |  | 367 |  | 405 |
Segment income (loss) before income taxes |  | (224) |  | (478) |  | (194) |  | (1,738) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |
Segment income (loss) |  | (224) |  | (478) |  | (194) |  | (1,738) |
Expenditures for segment assets |  | 22 |  | 3 |  | 82 |  | 12 |
Medical [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  |  |  |  |  |  |  |  |
Intercompany revenues |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  |
Research and development |  | 88 |  | 197 |  | 259 |  | 947 |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |
Segment income (loss) before income taxes |  | (88) |  | (197) |  | (259) |  | (947) |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |
Segment income (loss) |  | (88) |  | (197) |  | (259) |  | (947) |
Expenditures for segment assets |  |  |  |  |  |  |  |  |
Segments Total [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers |  | 11,984 |  | 11,758 |  | 37,801 |  | 37,179 |
Intercompany revenues |  | 190 |  | 87 |  | 518 |  | 212 |
Gross profit |  | 1,825 |  | 1,745 |  | 7,189 |  | 6,817 |
Research and development |  | 214 |  | 293 |  | 614 |  | 1,286 |
Interest income |  |  |  |  |  |  |  |  |
Interest expense |  | (9) |  | (2) |  | (18) |  | (29) |
Interest expense-financing fees |  |  |  |  |  |  |  |  |
Depreciation and amortization |  | 356 |  | 1,098 |  | 1,069 |  | 3,365 |
Segment income (loss) before income taxes |  | 194 |  | (635) |  | 3,826 |  | 195 |
Income tax (benefit) expense |  | (1,342) |  | 70 |  | (1,277) |  | (215) |
Segment income (loss) |  | 1,536 |  | (705) |  | 5,103 |  | (20) |
Expenditures for segment assets |  | 547 |  | 84 |  | 1,098 |  | 200 |
Corporate [Member] |  |  |  |  |  |  |  |  |
Revenue from external customers | [4] |  |  |  |  |  |  |  |
Intercompany revenues | [4] |  |  |  |  |  |  |  |
Gross profit | [4] |  |  |  |  |  |  |  |
Research and development | [4] | 15 |  |  |  | 66 |  | 14 |
Interest income | [4] | 82 |  | 34 |  | 212 |  | 105 |
Interest expense | [4] | (53) |  | (57) |  | (159) |  | (220) |
Interest expense-financing fees | [4] | (10) |  | (9) |  | (27) |  | (27) |
Depreciation and amortization | [4] | 8 |  | 9 |  | 26 |  | 29 |
Segment income (loss) before income taxes | [4] | (1,219) |  | (1,271) |  | (3,740) |  | (3,855) |
Income tax (benefit) expense | [4] |  |  | 1 |  | 5 |  | 3 |
Segment income (loss) | [4] | (1,219) |  | (1,272) |  | (3,745) |  | (3,858) |
Expenditures for segment assets | [4] | $ 1 |  |  |  | $ 4 |  |  |
[1] | Amounts include tangible asset impairment loss of $672,000 for the Company's M&EC subsidiary.
[2] | Amounts included a net gain of $1,596,000 recorded resulting from the exchange offer of the Series B Preferred Stock of our M&EC subsidiary (see "Note 13 - M&EC Series B Preferred Stock" below).
[3] | Amounts included a tax benefit recorded in the amount of approximately $1,380,000 during the third quarter. (see "Note 12 - Income Taxes" below).
[4] | Amounts reflect the activity for corporate headquarters not included in the segment information.

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