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SERIES B MANDATORILY REDEEMABLE PREFERRED STOCK (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |  |  |  |
Interest expense | $ 2,273,355 | $ 2,491,870 | $ 4,827,202 | $ 5,037,073 |
Redeemable Convertible Preferred Stock Series B |  |  |  |  |
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |  |  |  |
Number of shares redeemed (in shares) |  |  |  |  | 16,900
Value of shares redeemed |  |  |  |  | $ 16,900,000
Preferred stock shares outstanding (in shares) | 0 |  | 0 |  | 0
Interest expense |  | $ 61,000 |  | $ 122,000 |
Total unamortized deferred costs | $ 0 |  | $ 0 |  | $ 0

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