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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
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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 |

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