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ORGANIZATION AND BASIS OF PRESENTATION - Financial information of Company's VIE and VIES's subsidiaries and kindergartens (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial information of the Company's VIE and VIE's subsidiaries and kindergartens      
Cash and cash equivalents $ 104,084 $ 158,691  
Prepaid expenses and other current assets 11,243 9,541  
Total current assets 121,596 172,808  
Total assets 243,455 229,738  
Total current liabilities 108,339 97,022  
Total liabilities 128,487 124,444  
Total net revenues 156,498 140,803 $ 108,513
Net income (loss) (1,713) 6,541 5,887
Net cash provided by (used in) operating activities 828 25,099 35,053
Net cash used in investing activities (51,735) (8,655) (12,122)
Net cash provided by financing activities (756) 92,496 1,422
VIE      
Financial information of the Company's VIE and VIE's subsidiaries and kindergartens      
Cash and cash equivalents 41,133 64,626  
Prepaid expenses and other current assets 11,101 9,392  
Total current assets 58,503 78,594  
Total assets 157,834 133,897  
Total current liabilities 101,966 92,537  
Total liabilities 120,766 118,068  
Total net revenues 155,946 140,012 107,747
Net income (loss) 14,610 17,925 7,378
Net cash provided by (used in) operating activities (2,159) 25,453 32,181
Net cash used in investing activities (18,866) (7,573) (12,119)
Net cash provided by financing activities 436 381 1,422
Effects of exchange rate changes (2,701) 3,609 $ (2,572)
VIE's obligations      
Consolidated VIE's assets that are collateral for the VIE's obligations $ 0 $ 0