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BUSINESS ACQUISITIONS - Acquisition of Shandong Buladun (Details)
$ in Thousands
8 Months Ended
May 01, 2018
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Purchase price allocation of acquisitions      
Goodwill   $ 25,096 $ 428
Shandong Buladun      
BUSINESS ACQUISITIONS      
Percentage of equity interest 80.00%    
Consideration transferred $ 4,575    
Number of kindergartens operated | item 4    
Unsettled portion of the consideration   1,232  
Purchase price allocation of acquisitions      
Cash and cash equivalents $ 134    
Other current assets 21    
Property and equipment, net 1,819    
Other current liabilities (3,927)    
Deferred tax liabilities (236)    
Noncontrolling interest (915)    
Goodwill 6,737    
Total $ 4,575    
Net revenue   2,393  
Pre-tax net income   $ 958  
Shandong Buladun | Minimum      
Purchase price allocation of acquisitions      
Depreciation or amortization period 5 years    
Shandong Buladun | Maximum      
Purchase price allocation of acquisitions      
Depreciation or amortization period 8 years    
Shandong Buladun | Student base      
Purchase price allocation of acquisitions      
Intangible assets $ 942    
Amortization period - intangible assets 4 years