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SEGMENT INFORMATION (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | segment | 1 |  |
Number of reportable segments | segment | 1 |  |
Net revenues: |  |  |
Total net revenues | $ 156,498 | $ 140,803 | $ 108,513
Cost of revenues: |  |  |
Total cost of revenues | 130,864 | 111,277 | 91,616
Gross profit |  |  |
Total gross profit | 25,634 | 29,526 | 16,897
Kindergartens |  |  |
Net revenues: |  |  |
Total net revenues | 124,175 | 105,679 | 78,766
Play-and-learn centers |  |  |
Net revenues: |  |  |
Total net revenues | 26,777 | 29,871 | 25,390
Others |  |  |
Net revenues: |  |  |
Total net revenues | 5,546 | 5,253 | 4,357
Operating segments |  |  |
Net revenues: |  |  |
Total net revenues | 156,498 | 140,803 | 108,513
Cost of revenues: |  |  |
Total cost of revenues | 130,864 | 111,277 | 91,616
Gross profit |  |  |
Total gross profit | 25,634 | 29,526 | 16,897
Operating segments | Kindergartens |  |  |
Net revenues: |  |  |
Total net revenues | 124,175 | 105,679 | 78,766
Cost of revenues: |  |  |
Total cost of revenues | 108,140 | 88,281 | 68,491
Gross profit |  |  |
Total gross profit | 16,035 | 17,398 | 10,275
Operating segments | Play-and-learn centers |  |  |
Net revenues: |  |  |
Total net revenues | 26,777 | 29,871 | 25,390
Cost of revenues: |  |  |
Total cost of revenues | 15,694 | 18,129 | 17,320
Gross profit |  |  |
Total gross profit | 11,083 | 11,742 | 8,070
Operating segments | Others |  |  |
Net revenues: |  |  |
Total net revenues | 5,546 | 5,253 | 4,357
Cost of revenues: |  |  |
Total cost of revenues | 7,030 | 4,867 | 5,805
Gross profit |  |  |
Total gross profit | $ (1,484) | $ 386 | $ (1,448)

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