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STOCKHOLDERS' EQUITY - Equity Financing (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 2 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Nov. 29, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.001 | $ 0.001 |
ATM Facility |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.001
Aggregate sales price |  | $ 200.0 |  |  |  |  |
Shares reserved for future issuance amount |  |  |  |  | $ 97.8 |  |
Commission fixed rate | 3.00% |  |  |  |  |  |
Proceeds from sale of stock |  |  | $ 64.3 | $ 136.8 |  |  |
Sale of stock, number of units issued (in shares) |  |  | 16.5 | 47.1 |  |  |
Weighted-average stock price per share (in dollars per share) |  |  | $ 4.02 | $ 2.99 |  |  |
Issuance of common stock, issuance cost |  |  | $ 2.0 | $ 4.2 |  |  |

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