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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
6 Months Ended
Jun. 30, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Summary of Assets and Liabilities Measurements on a Recurring Basis
As of June 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 follow (in thousands):
June 30, 2021December 31, 2020
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets
Investments:
Commercial paper, available for sale$— $96,896 $— $96,896 $— $— $— $— 
Corporate Bonds, available for sale— 97,649 — 97,649 — — — — 
Municipal bonds, available for sale— 5,887 — 5,887 — — — — 
Total investments$— $200,432 $— $200,432 $— $— $— $— 
Liabilities
Warrant liability:
RTI warrants$— $— $15,000 $15,000 $— $— $— $— 
Private warrants— — 2,899 2,899 — — — — 
Total warrant liability$— $— $17,899 $17,899 $— $— $— $— 
RTI warrants  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value Measurement Inputs
The Company has determined its warrant to be a Level 3 fair value measurement and has remeasured using the Black-Scholes option pricing model to calculate its fair value as of June 30, 2021 using the following assumptions:
Expected annual dividend yield— %
Expected volatility48.51 %
Risk-free rate of return0.56 %
Expected option term (years)3.75
Level 3 Liabilities Measured at Fair Value
Changes in Level 3 liabilities measured at fair value for six months ended June 30, 2021 are as follows (in thousands):
Fair value
(Level 3)
Balance at December 31, 2020$— 
Change in fair value15,000 
Balance at June 30, 2021$15,000 
Private warrants  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Fair Value Measurement Inputs 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:
June 30, 2021March 18, 2021 (Initial Recognition)
Expected annual dividend yield— %— %
Expected volatility46.4 %47.3 %
Risk-free rate of return0.81 %0.86 %
Expected option term (years)4.725.0
Level 3 Liabilities Measured at Fair Value
A summary of the private warrants activity from the Business Combination date at March 18, 2021 to June 30, 2021 is as follows:

Fair value
(Level 3)
Balance at March 18, 2021$4,604 
Change in fair value(1,705)
Balance at June 30, 2021$2,899