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EQUITY - Stock options (Details) - Stock options | 1 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 employee $ / shares shares | Aug. 31, 2017 $ / shares shares | Jul. 31, 2017 employee shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock option valuation method |  |  |  | Black-Scholes valuation model |
Stock options granted |  |  | 135,000 | 400,000 | 179,047
Number of employees | employee | 102 |  | 11 |  |
2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 0.33% |  |
2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 0.33% |  |
2020 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  |  | 0.33% |  |
Chief Executive Officer ("CEO") |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted | 400,000 | 19,047 |  |  |
Granted | $ / shares | $ 8.75 | $ 5.25 |  |  |
Chief Financial Officer ("CFO") |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted |  | 25,000 |  |  |
Granted | $ / shares |  | $ 5.25 |  |  |
Chief Financial Officer ("CFO") | 2018 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 0.33% |  |  |
Chief Financial Officer ("CFO") | 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 0.33% |  |  |
Chief Financial Officer ("CFO") | 2020 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting percentage |  | 0.33% |  |  |

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