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STOCKHOLDERS' EQUITY DEFICIT - Warrants Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Proceeds from exercises of common stock warrants |  |  | $ 1,126 | $ 131 | $ 5,481 |  |
Exercise of common stock warrants (in shares) |  |  | 2,048,000 |  |  |  |
Increase in warrant value |  |  | $ 1,100 |  |  |  |
Exercise price per warrant (in dollars per share) |  |  |  |  |  |  | $ 1.47
Deemed dividend |  | $ 100 |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise of common stock warrants (in shares) |  |  | 2,048,059 | 238,110 | 6,772,928 |  |
2018 Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise of common stock warrants (in shares) |  |  | 1,573,000 |  |  |  |
Exercise price per warrant (in dollars per share) |  |  | $ 0.55 |  |  |  |
2018 Warrants | Common Stock |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Proceeds from exercises of common stock warrants | $ 2,000 |  |  |  |  |  |
Exercise of common stock warrants (in shares) | 3,400,000 |  |  |  |  |  |
Exercise price per warrant (in dollars per share) | $ 0.60 | $ 0.55 |  |  |  | $ 1.20 |
2017 Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise of common stock warrants (in shares) |  |  | 475,000 |  |  |  |
Exercise price per warrant (in dollars per share) |  |  | $ 0.55 |  |  |  |
2017 Warrants | Common Stock |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price per warrant (in dollars per share) | $ 0.55 |  |  |  |  | 0.80 |
2018 Warrant Amendment, Amendment to Securities Purchase Agreement |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Minimum percentage of securities issued | 50.10% |  |  |  |  |  |
2018 Warrant Amendment, Amendment to Securities Purchase Agreement | Common Stock |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Exercise price per warrant (in dollars per share) | $ 0.95 |  |  |  |  | $ 1.20 |

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