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SIGNIFICANT ACCOUNTING POLICIES - Net revenues and Contract liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net revenues      
Total net revenues $ 156,498 $ 140,803 $ 108,513
Contract liabilities      
Prepayments from customers, current 6,647 11,968  
Prepayments from customers, non-current 3,582 8,542  
Deferred revenue, current 29,578 22,666  
Deferred revenue, non-current 6,915 10,396  
Revenue recognized related to contract liabilities that existed in previous year 31,000    
Contract assets recorded $ 0 0  
Practical expedient related to incremental cost to obtain contracts true    
Services      
Net revenues      
Total net revenues $ 139,216 122,869 95,936
Tuition fees from kindergartens and play-and-learn centers      
Net revenues      
Total net revenues 117,080 100,745 78,268
Franchise fees      
Net revenues      
Total net revenues 14,365 13,537 12,425
Training and other services      
Net revenues      
Total net revenues 7,161 7,703 5,243
Royalty fees      
Net revenues      
Total net revenues 610 884  
Products      
Net revenues      
Total net revenues 17,282 17,934 12,577
Sale of educational merchandise      
Net revenues      
Total net revenues 17,282 17,934 12,577
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