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WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 28, 2021 | Apr. 07, 2021 | Aug. 20, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 25, 2021
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) | 50,207,439 |  |  |  |  |  |  |
Conversion of securities into common stock (in shares) | 2,759,970 |  |  |  |  |  |  |
Loss from fair value adjustment | $ 100,900 |  |  | $ (67,179) | $ (1,918) | $ (133,577) | $ (909) |
Conversion of securities into common stock | $ 60,600 |  |  |  |  |  |  |
Sale of stock, number of shares Issued in transaction (in shares) |  |  |  |  |  | 22,500,000 |  |
Number of shares called from each warrant (in shares) |  |  | 1 |  |  |  |  |
Exercise Price (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Number of shares called from exchange of warrants (in shares) |  | 350,000 |  |  |  |  |  |
Warrants and rights outstanding |  |  |  | 304,300 |  | $ 304,300 |  |
Issuance of common stock warrants for services (Note 8) |  | $ 9,200 |  | $ 9,183 |  |  |  |
Legacy Stem Warrants |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  | 23,634 |  | 23,634 |  |
Public Warrants |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares Issued in transaction (in shares) |  |  | 12,786,168 |  |  |  |  |
Exercise Price (in dollars per share) |  |  | $ 11.50 |  |  |  |  |
Warrants and rights outstanding |  |  |  | $ 185,900 |  | $ 185,900 |  |
Private Warrants |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  | 0 |  | 0 |  |
Loss from fair value adjustment |  |  |  |  |  | $ 52,000 |  |
Number of shares called from exchange of warrants (in shares) |  |  |  | 7,181,134 |  | 7,181,134 |  |
Warrants and rights outstanding |  |  |  | $ 118,400 |  | $ 118,400 |  |
Private Warrants | Subsequent Event |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  | 7,181,134
Number of shares called from exchange of warrants (in shares) |  |  |  |  |  |  |  | 4,683,349

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