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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Summary of Assets and Liabilities Measurements on a Recurring Basis
As of September 30, 2021 and December 31, 2020, the Company’s financial assets and liabilities measured and recorded at fair value on a recurring basis were classified within the fair value hierarchy as follows (in thousands):
September 30, 2021December 31, 2020
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets
Investments:
Commercial paper, available for sale$— $83,723 $— $83,723 $— $— $— $— 
Corporate Bonds, available for sale— 94,974 — 94,974 — — — — 
Municipal bonds, available for sale— 5,878 — 5,878 — — — — 
Total investments$— $184,575 $— $184,575 $— $— $— $— 
Liabilities
Warrant liability:
RTI warrants$— $— $8,214 $8,214 $— $— $— $— 
Private warrants— — 1,316 1,316 — — — — 
Total warrant liability$— $— $9,530 $9,530 $— $— $— $— 
RTI warrants  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value Measurement Inputs
The Company has determined its warrant to be a Level 3 fair value measurement and has remeasured using the Black-Scholes option pricing model to calculate its fair value for both initial measurement upon close of the Business Combination and subsequent measurement using the following assumptions:
September 30, 2021March 18, 2021 (Initial Recognition)
Expected annual dividend yield— %— %
Expected volatility55.49 %48.51 %
Risk-free rate of return0.59 %0.54 %
Expected option term (years)3.253.79
Level 3 Liabilities Measured at Fair Value Changes in Level 3 liabilities measured at fair value for nine months ended September 30, 2021 are as follows (in thousands):
Fair value
(Level 3)
Balance at December 31, 2020$— 
Change in fair value8,214 
Balance at September 30, 2021$8,214 
Private warrants  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value Measurement Inputs
The private warrants are measured at fair value on a recurring basis using a Black-Scholes model. The private warrants are classified as Level 3 for both initial measurement upon close of the Business Combination and subsequent measurement using the following assumptions:
September 30, 2021March 18, 2021 (Initial Recognition)
Expected annual dividend yield— %— %
Expected volatility56.2 %47.3 %
Risk-free rate of return0.86 %0.86 %
Expected option term (years)4.475.0
Level 3 Liabilities Measured at Fair Value
A summary of the private warrants activity from the Business Combination date at March 18, 2021 to September 30, 2021 is as follows:
Fair value
(Level 3)
Balance at March 18, 2021$4,604 
Change in fair value(3,288)
Balance at September 30, 2021$1,316