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ORDINARY SHARES (Narrative) (Details) - $ / shares | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 22, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Jan. 01, 2017
ORDINARY SHARES [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period | 293,059 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price | $ 0.4749 |  |  |
Restricted stock [Member] |  |  |  |
ORDINARY SHARES [Line Items] |  |  |  |
Number of ordinary shares converted to Class A ordinary shares | 293,059 |  |  |
Awards vested | 0 | 15,027 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 200,000 |  |  |
Restricted stock [Member] | Employees [Member] |  |  |  |
ORDINARY SHARES [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |
Class A Ordinary Shares [Member] |  |  |  |
ORDINARY SHARES [Line Items] |  |  |  |
Shares issued |  | 34,206,939 | 38,756,289 | 33,990,680
Shares outstanding |  | 34,206,939 | 38,756,289 | 33,990,680
Class C Ordinary Shares [Member] |  |  |  |
ORDINARY SHARES [Line Items] |  |  |  |
Shares issued |  | 4,708,415 | 4,708,415 | 4,708,415
Shares outstanding |  | 4,708,415 | 4,708,415 | 4,708,415

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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