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STOCK-BASED COMPENSATION - Summary of ESPP Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |
Proceeds from common stock issued under ESPP | $ 6,832 | $ 4,304 | $ 1,692
Shares of common stock issued (shares) | 235 | 347 | 315
Weighted-average price per share (usd per share) | $ 29.12 | $ 12.41 | $ 5.37

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