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DEBT - Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Long-term debt |  |
Balance, beginning of year | $ 48,866 | $ 48,160
Promissory note- initial recognition | 15,000 |
Interest expense | 1,389 | 5,581
Interest payments | (1,202) | (4,875)
Bonus Interest - Equity based financing fee | (500) |
Balance, end of year | $ 63,553 | $ 48,866

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