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2020 Notes (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Key Valuation Assumptions Key valuation assumptions are as follows:
At inception
Fundraise scenarioIPO cash payout scenarioIPO conversion scenarioLiquidation cash payout scenarioLiquidation conversion scenario
Expected term (years)2.00 0.30 0.30 2.00 2.00 
Discount rate24.2 %24.2 24.2 %24.2 24.2 %
Weighting18.6 %12.9 %— %50.0 %18.6 %