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CONVERTIBLE NOTES (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Loss on extinguishment of convertible notes | $ 831 |  |
Amortization of debt issuance costs and debt discount | 2,673 | $ 3,470 | $ 2,991
2021 Notes |  |  |
Contractual interest expense | 2,855 | 4,344 | 4,344
Debt discount amortization | 2,575 | 3,470 | 2,991
Loss on extinguishment of convertible notes | 831 |  |
Other expenses |  | 1,300 |
Total | 6,261 | $ 9,114 | $ 7,335
2024 Notes |  |  |
Contractual interest expense | 767 |  |
Amortization of debt issuance costs and debt discount | 97 |  |
Total | $ 864 |  |

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