STOCK BASED COMPENSATION - Options (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Stock-based compensation | ||
| Options granted (in shares) | 406,752 | 1,105,604 |
| Stock-based compensation expense | $ 11,177 | $ 8,026 |
| Unrecognized stock-based compensation balance for unvested options | $ 18,800 | |
| Weighted-average fair value of options granted (in dollars per share) | $ 8.43 | $ 18.84 |
| Options | ||
| Stock-based compensation | ||
| Stock-based compensation expense | $ 9,300 | $ 7,100 |
| Unrecognized stock-based compensation balance for unvested options expected to be recognized (in years) | 2 years 4 months 24 days | |