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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

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