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BUSINESS - Narrative (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 28, 2021 USD ($) $ / shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Apr. 27, 2021 $ / shares | Dec. 31, 2020 USD ($) $ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |
Proceeds received | $ 550,300 |  |  |  |  | $ 550,322 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  | $ 0.0001 |  | $ 0.00001 | $ 0.0001
Common stock, par value (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  | $ 0.0001 |  | $ 0.000001 | $ 0.0001
Exchange ratio | 4.6432 |  |  |  |  |  |  |  |
Sale of stock, number of shares Issued in transaction (in shares) | shares |  |  |  |  |  | 22,500,000 |  |  |
Sale of stock (in dollars per share) | $ / shares | $ 10 |  |  |  |  |  |  |  |
Sale of stock aggregate purchase price |  |  |  |  |  | $ 225,000 |  |  |
Net liabilities | $ 304,000 |  |  |  |  |  |  |  |
Liquidity And Going Concern [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 474,138 |  |  |  | 474,138 |  |  | $ 6,942
Accumulated deficit |  | 590,610 |  |  |  | 590,610 |  |  | $ 407,841
Working capital |  | 452,500 |  |  |  | 452,500 |  |  |
Debt financing coming due within the next 12 months |  | 15,300 |  |  |  | 15,300 |  |  |
Net loss |  | $ 100,216 | $ 82,553 | $ 18,981 | $ 17,471 | 182,769 | $ 36,452 |  |
Negative cash flows from operating activities |  |  |  |  |  | $ 41,833 | $ 16,497 |  |

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