SHORT TERM INVESTMENTS (Details) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2019 |
Dec. 31, 2018 |
|
| Cash and Cash Equivalents [Line Items] | ||
| Maturity of Time Deposits | 4 months | 4 months |
| Minimum [Member] | ||
| Cash and Cash Equivalents [Line Items] | ||
| Percentage of Interest Bearing Bank Deposits | 0.05% | 0.05% |
| Maximum [Member] | ||
| Cash and Cash Equivalents [Line Items] | ||
| Percentage of Interest Bearing Bank Deposits | 3.15% | 3.15% |