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FAIR VALUE MEASUREMENTS - Convertible Preferred Stock Warrant Liabilities (Details) - Outstanding convertible preferred stock warrants | Dec. 31, 2020 | Dec. 31, 2019
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Volatility |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 65.0 | 65.0
Risk-free interest rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 0.1 | 1.6
Expected term (in years) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 1.5 | 2.5
Discount for lack of marketability |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Measurement input | 12.3 | 40.0

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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