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Fair Value - Summary of Key Assumptions for determining redeemable convertible preferred stock warrants (Details) - Redeemable convertible preferred stock warrants | Dec. 31, 2020 | Dec. 31, 2019
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Volatility |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 60 |
Expected dividend rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 0 |
Minimum | Expected term |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 2 |
Minimum | Risk free rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 0.23 |
Maximum | Expected term |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 9 |
Maximum | Risk free rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input | 2.11 |
Weighted Average | Expected term |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input |  | 6.36
Weighted Average | Risk free rate |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Warrants, measurement input |  | 1.72

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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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