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SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Accumulated deficit |  | $ (30,421) | $ (28,879) |
Total net revenues |  | 156,498 | 140,803 | $ 108,513
Franchise fees |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Total net revenues |  | $ 14,365 | $ 13,537 | $ 12,425
Franchising fees |  |  |  |
Number of performance obligations | item |  | 2 |  |
Franchise fees | Minimum |  |  |  |
Franchising fees |  |  |  |
Estimate of time required to set up kindergartens and play-and-learn centers (in months) |  | 7 months |  |
Franchise fees | Maximum |  |  |  |
Franchising fees |  |  |  |
Estimate of time required to set up kindergartens and play-and-learn centers (in months) |  | 8 months |  |
ASC 606 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Accumulated deficit | $ 931 |  |  |
Total net revenues | $ 1,151 |  |  |

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