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Fair value measurements
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair value measurements
Note 6 - Fair Value Measurements

The Company uses a three-tier fair value hierarchy to prioritize the inputs used in the fair value measurements. All of the Company's cash and cash equivalents are classified within Level 1 as they are valued using quoted market prices or alternative pricing sources. The Public Warrants are classified as Level 1 due to the use of an observable market quote in an active market. The senior secured term loan is classified within Level 2 as they are valued using market-based risk measurements that are indirectly observable, such as credit risk. Private Warrants are classified within Level 3.

The following tables present information about the Company’s liabilities that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value.
Carrying AmountTotalLevel 1Level 2Level 3
December 31, 2021(in thousands)
Liabilities
Senior secured term loan$39,995 $41,242 $— $41,242 $— 
Public warrants16,036 16,036 16,036 — — 
Private warrants11,036 11,036 — — 11,036 
Total$67,067 $68,314 $16,036 $41,242 $11,036 
March 31, 2022
Liabilities
Senior secured term loan$35,996 $37,118 $— $37,118 $— 
Public warrants7,328 7,328 7,328 — — 
Private warrants5,043 5,043 — — 5,043 
Total$48,367 $49,489 $7,328 $37,118 $5,043 

Level 2 valuation - senior secured term loan

The Company measures the fair value of the senior secured term loan using discounted cash flows and market-based expectations for credit risk and market risk.

Level 3 valuation - Private Warrants

As of March 31, 2022, the Company has Private Warrants defined and discussed in Note 10 - Warrants. The warrants are measured at fair value on a recurring basis. The Binomial Lattice Model's primary unobservable input utilized in determining the fair value of the Private Warrants is the expected volatility of the common stock. The expected volatility as of the Closing was derived from observable Public Warrants pricing. The expected volatility as of subsequent valuation dates was implied from the Company’s own Public Warrants pricing. Accordingly, the Private Warrants are classified as Level 3 financial instruments. The following table provides quantitative information regarding Level 3 Private Warrants fair value measurements inputs at their measurement dates:

March 31, 2022December 31, 2021
Expected dividend yield— %— %
Risk-free interest rate2.4 %1.2 %
Expected volatility242.0 %132.5 %
Expected term (in years)4.44.5

The Private Warrants were valued as of March 31, 2022 using the estimated fair value price of $0.85 per Private Warrant. The changes in the fair value of the Private Warrants, Public Warrants and Legacy Volta preferred stock warrants were as follows:
(in thousands)
December 31, 2020$698 
Increase (decrease) in fair value of warrants(88)
March 31, 2021$610 
December 31, 2021$27,072 
Increase (decrease) in fair value of Private and Public Warrants(14,700)
March 31, 2022$12,372 

There were no transfers of financial instruments between levels of the hierarchy for the three months ended March 31, 2022 and 2021.