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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value (Details) - Fair Value, Recurring - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Public Warrants |  |
Liabilities |  |
Warrant liability | $ 303,798 |
Convertible Preferred Stock Warrant |  |
Liabilities |  |
Warrant liability |  | $ 95,342
Money market fund |  |
Assets |  |
Cash equivalents | 225,795 | 67
Level 1 | Public Warrants |  |
Liabilities |  |
Warrant liability | 303,798 |
Level 1 | Convertible Preferred Stock Warrant |  |
Liabilities |  |
Warrant liability |  | 0
Level 1 | Money market fund |  |
Assets |  |
Cash equivalents | 225,795 | 67
Level 2 | Public Warrants |  |
Liabilities |  |
Warrant liability | 0 |
Level 2 | Convertible Preferred Stock Warrant |  |
Liabilities |  |
Warrant liability |  | 0
Level 2 | Money market fund |  |
Assets |  |
Cash equivalents | 0 | 0
Level 3 | Public Warrants |  |
Liabilities |  |
Warrant liability | 0 |
Level 3 | Convertible Preferred Stock Warrant |  |
Liabilities |  |
Warrant liability |  | 95,342
Level 3 | Money market fund |  |
Assets |  |
Cash equivalents | $ 0 | $ 0

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- Definition Warrant Liability + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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