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BUSINESS ACQUISITIONS - Acquisition in DKW (Details) $ in Thousands |  | 1 Months Ended | 5 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2018 USD ($) item | Sep. 30, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Purchase price allocation of acquisitions |  |  |  |
Goodwill |  |  | $ 25,096 | $ 428
Digital Knowledge World Co., Ltd. |  |  |  |
BUSINESS ACQUISITIONS |  |  |  |
Percentage of equity interest | 90.00% |  |  |
Consideration transferred | $ 17,130 |  |  |
Number of kindergartens operated | item | 3 |  |  |
Purchase price allocation of acquisitions |  |  |  |
Cash and cash equivalents | $ 4,773 |  |  |
Other current assets | 4,013 |  |  |
Property and equipment, net | 1,322 |  |  |
Other current liabilities | (7,235) |  |  |
Deferred tax liabilities | (696) |  |  |
Noncontrolling interest | (1,523) |  |  |
Goodwill | 13,693 |  |  |
Total | $ 17,130 |  |  |
Depreciation or amortization period | 5 years |  |  |
Net revenue |  |  | 3,493 |
Pre-tax net income |  |  | $ 463 |
Digital Knowledge World Co., Ltd. | Student base |  |  |  |
Purchase price allocation of acquisitions |  |  |  |
Intangible assets | $ 1,721 |  |  |
Amortization period - intangible assets |  | 4 years |  |
Digital Knowledge World Co., Ltd. | Trademark |  |  |  |
Purchase price allocation of acquisitions |  |  |  |
Intangible assets | $ 1,062 |  |  |
Amortization period - intangible assets |  | 5 years |  |

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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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