INVESTMENTS HELD-TO-MATURITY (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
|
| Schedule of Held-to-maturity Securities [Line Items] | |||||
| Amortized cost | $ 4,500,000 | $ 4,500,000 | |||
| Fair value | 4,500,000 | 4,500,000 | |||
| Unrealized gain (loss) | 0 | ||||
| Investments held-to-maturity | 4,483,000 | 4,483,000 | $ 16,863,000 | ||
| Interest and investment income | 72,000 | $ 98,000 | 178,000 | $ 146,000 | |
| Commercial Paper | Commercial Paper, Maturing August 2019 | |||||
| Schedule of Held-to-maturity Securities [Line Items] | |||||
| Investments held-to-maturity | 3,000,000 | 3,000,000 | |||
| Commercial Paper | Commercial Paper, Maturing September 2019 | |||||
| Schedule of Held-to-maturity Securities [Line Items] | |||||
| Investments held-to-maturity | $ 1,500,000 | $ 1,500,000 | |||
| X | ||||||||||
- Definition Debt Securities, Held to Maturity, Amortized Cost No definition available.
|
| X | ||||||||||
- Definition Debt Securities, Held-to-maturity, Fair Value No definition available.
|
| X | ||||||||||
- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|