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SEGMENT REPORTING - Summary of the Company's Segment Net Sales, Gross Profit and Segment Margin (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEGMENT REPORTING |  |  |  |
Net Sales by Segment | [1] | $ 65,623 | $ 115,944 | $ 98,292
Net Sales by Segment (as a percent) |  | 100.00% | 100.00% | 100.00%
Gross profit (loss) by Segment |  | $ 24,157 | $ 32,268 | $ 33,146
Gross profit (loss) by Segment (as a percent) |  | 37.00% | 28.00% | 34.00%
Income (loss) before income taxes |  | $ (3,944) | $ 4,442 | $ 8,244
Operating segments |  |  |  |
SEGMENT REPORTING |  |  |  |
Total Segment income |  | 10,052 | 20,068 | 23,346
Operating segments | Equipment |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 43,722 | $ 97,680 | $ 77,283
Net Sales by Segment (as a percent) |  | 67.00% | 84.00% | 79.00%
Gross profit (loss) by Segment |  | $ 14,156 | $ 25,598 | $ 26,647
Gross profit (loss) by Segment (as a percent) |  | 32.00% | 26.00% | 34.00%
Total Segment income |  | $ 51 | $ 13,398 | $ 16,847
Operating segments | Services |  |  |  |
SEGMENT REPORTING |  |  |  |
Net Sales by Segment |  | $ 21,901 | $ 18,264 | $ 21,009
Net Sales by Segment (as a percent) |  | 33.00% | 16.00% | 21.00%
Gross profit (loss) by Segment |  | $ 10,001 | $ 6,670 | $ 6,499
Gross profit (loss) by Segment (as a percent) |  | 46.00% | 37.00% | 31.00%
Total Segment income |  | $ 10,001 | $ 6,670 | $ 6,499
General and Corporate |  |  |  |
SEGMENT REPORTING |  |  |  |
General and Corporate |  | $ (13,996) | $ (15,626) | $ (15,102)
[1] | The revenue recognized in the years ended December 31, 2019, 2018 and 2017 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period were $2.8 million, $4.0 million and $2.7 million, respectively.

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