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STOCK-BASED COMPENSATION, Non-nested, Service-based Restricted Stock and RSU Awards (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Service-based Restricted Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 200,000 |  | $ 400,000 |
Service-based Restricted Stock Awards [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 100,000 |  | $ 100,000
Service-based Restricted Stock and RSU Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
2019 | 404,977 |  | 404,977 |
2020 | 777,537 |  | 777,537 |
2021 | 758,325 |  | 758,325 |
2022 | 721,284 |  | 721,284 |
2023 | 509,910 |  | 509,910 |
Unrecognized compensation cost | $ 3,172,033 |  | 3,172,033 |
Performance Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 0 |
Restricted Stock and RSUs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares vested (in shares) |  |  | 1,408 | 16,648

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