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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)