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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