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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities Measured on Recurring Basis
The following table sets forth the Company’s financial assets and liabilities, measured at fair value on a recurring basis, as of March 31, 2021 and December 31, 2020 (in thousands):
March 31, 2021
Fair Value Measured Using 
(Level 1)(Level 2)(Level 3)Total Balance
Assets    
Money market funds$280,099 $— $— $280,099 
Liabilities
Common stock warrant liability$— $— $420 $420 
December 31, 2020
 Fair Value Measured Using 
 (Level 1)(Level 2)(Level 3)Total Balance
Assets    
Money market funds$85,797 $— $— $85,797 
Liabilities
Common stock warrant liability$— $— $447 $447 
Summary of Issuances, Exercises, Changes in Fair Value and Reclassifications of Level 3 Financial Instruments
The following table presents the issuances, exercises, changes in fair value and reclassifications of the Company’s Level 3 financial instruments that are measured at fair value on a recurring basis (in thousands):
 (Level 3)
 Common Stock Warrant Liability
Balance as of December 31, 2020
$447 
Exercise of warrants— 
Change in estimated fair value(27)
Balance as of March 31, 2021
$420 
Summary of Common Stock Warrant Liability Valuation Assumptions
Common Stock Warrant Liability Valuation Assumptions:
March 31, 2021December 31, 2020
Private Placement Common Stock Warrant Liability
Stock Price$68.09 $72.45 
Exercise Price$1.12 $1.12 
Remaining term (in years)2.042.28
Volatility72.00 %73.00 %
Risk-free interest rate0.17 %0.14 %