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CONVERTIBLE NOTES (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 25, 2021 | Sep. 30, 2021 | Sep. 30, 2021
Net payment for convertible notes |  |  | $ 25,990,000
Loss on extinguishment of convertible notes |  |  | (831,000)
Reacquisition of equity component of convertible notes |  | $ 12,019,000 | 12,019,000
Equity component of convertible notes, net of transaction costs |  | 12,027,000 | (12,027,000)
Transactions costs in connection with the exchange of convertible notes |  |  | 774,000
Minimum cash balance required |  | 7,500,000 | 7,500,000
Minimum unrestricted cash balance to be maintained |  | 3,270,000 | 3,270,000
2021 Notes |  |  |
Principal amount | $ 54,650,000 |  |
Loss on extinguishment of convertible notes |  |  | (800,000)
Derecognition of liability component |  | $ 54,800,000 | 54,800,000
Reacquisition of equity component of convertible notes |  |  | $ (12,000,000.0)
2024 Notes |  |  |
Principal amount | 28,750,000 |  |
Net payment for convertible notes | 25,900,000 |  |
Convertible notes exchange in cash, accrued and unpaid interest | 1,100,000 |  |
Base value for conversion rate | $ 1,000 |  |
Number of shares for basis conversion | 563.2216 |  |
Conversion price per share | $ 1.7755 |  |
Percentage of Premium to Closing Price of Stock | 32.50% |  |
Interest rate | 7.50% | 7.50% | 7.50%
Mature term |  |  | 3 years
Equity component of convertible notes, net of transaction costs |  |  | $ 12,000,000.0
Transactions costs in connection with the exchange of convertible notes |  |  | $ 869,000

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