Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of financial instruments measured at fair value

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 Amount		Total		Level 1		Level 2		Level 3
			(in thousands)
December 31, 2020
Liabilities
PPP loan	$	3,193	$	3,193	$	—	$	3,193	$	—
Senior secured term loan	49,000		50,960		—		50,960		—
Preferred Stock warrant liability	698		698		—		—		698
Total	$	52,891	$	54,851	$	—	$	54,153	$	698
December 31, 2021
Liabilities
Senior secured term loan	39,995		41,242		—		41,242		—
Private warrants	11,036		11,036		—		—		11,036
Public warrants	16,036		16,036		16,036		—
Total	$	67,067	$	68,314	$	16,036	$	41,242	$	11,036

Schedule of fair value measurement inputs and valuation techniques

The following table provides quantitative information regarding Level 3 Legacy Volta Preferred Stock warrants fair value measurement inputs at their measurement dates:

	December 31, 2020
Expected dividend yield	—	%
Risk-free interest rate	0.53	%
Expected volatility	50.00	%
Expected term (in years)	4.50

The following table provides quantitative information regarding Level 3 Private Warrants fair value measurement inputs at their measurement dates:

	August 26, 2021		December 31, 2021
Expected dividend yield	—	%	—	%
Risk-free interest rate	0.80	%	1.18	%
Expected volatility	33.40	%	132.50	%
Expected term (in years)	4.8		4.5

Schedule of derivative liabilities at fair value

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, 2019	$	288
Increase in fair value of warrants	410
December 31, 2020	$	698
Increase in fair value of Preferred Stock warrants	1,246
Release of liability upon exercise of Preferred Stock warrants	(1,944)
Addition of Private and Public Warrants	27,079
Release of liability upon exercise of Public Warrants	(1)
Decrease in fair value of Private and Public warrants	(7)
December 31, 2021	$	27,071

	Private Warrants	Public Warrants	Total common stock warrants
Outstanding as of December 31, 2020	—	—	—
Common stock warrants added upon the Reverse Recapitalization	5,933,333	8,621,715	14,555,048
Warrants exercised	—	(275)	(275)
Outstanding as of December 31, 2021	5,933,333	8,621,440	14,554,773