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SHARE BASED COMPENSATION (Narrative) (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 03, 2017 | Sep. 09, 2015 | Jan. 12, 2015 | Dec. 21, 2018 | Jun. 06, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted |  | 12,569,166 | 6,274,166 |  |  | 0 |  |  | 8,134,375 |
Weighted average fair value of stock options granted |  |  |  |  |  |  |  |  | $ 0.59 |
Share-based compensation |  |  |  |  |  | $ 13,788,049 | $ 4,200,273 | $ 2,702,089 |  |
Unrecognized compensation cost related to non-vested stock options |  |  |  |  |  | $ 76,911 |  |  |  |
Unrecognized compensation cost, recognition period |  |  |  |  |  | 4 months 27 days |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price |  | $ 0.59 | $ 0.87 |  |  | $ 0.59 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost Adjustment Description |  | The total incremental cost associated with the modification was $282,581, of which $123,322 was recognized immediately for the options vested prior to the date of the modification and the remaining share-based compensation charges of $159,259 are recognized over the remaining vesting period of the modified options. | The total incremental cost associated with the modification was $241,557, of which $60,107 was recognized immediately for the options vested prior to the date of the modification and the remaining share-based compensation charges of $181,470 are recognized over the remaining vesting period of the modified options. |  |  |  |  |  |  |
Restricted Stock or Unit Expense |  |  |  |  |  | $ 13,103,276 |  |  |  |
Share Incentive Plan 2014 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized |  |  |  |  |  | 21,000,000 |  |  |  |
Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Ordinary shares authorized |  |  |  |  |  |  |  |  |  | 38,600,000
Share-based Compensation Award, Batch One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | $ 0.38 |  |  |  |  |  |  |  |
Share-based Compensation Award, Batch Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | 0.35 |  |  |  |  |  |  |  |
Share-based Compensation Award, Batch Three [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | 0.38 |  |  |  |  |  |  |  |
Share-based Compensation Award, Batch Four [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | 0.37 |  |  |  |  |  |  |  |
Share-based Compensation Award, Batch Five [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  | $ 0.40 |  |  |  |  |  |  |  |
Executive officers [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  |  | $ 0.52 |  |  |  |  |  |  |
Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted |  |  | $ 0.55 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost, recognition period |  |  |  |  |  | 3 years 9 months 25 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  | $ 1.48 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options |  |  |  |  |  | $ 60,140,629 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  | 44,365,641 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2014 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 12,653,992 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 25,275,880 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2014 and 2018 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 8,105,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] | Share Incentive Plan 2018 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  | 10,984,761 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award |  |  |  |  | where 1/6 of the RSUs will be vested on the grant date and the remaining will be vested 1/30 at each of the monthly anniversary for the grant date from July 6, 2018. |  |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | $ 684,773 | $ 1,559,863 | $ 2,702,089 |  |

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