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PUBLIC OFFERING AND PRIVATE PLACEMENT (Tables)
9 Months Ended
Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]  
Schedule of Derivative Liabilities at Fair Value
The fair value of the warrants has been estimated with the following weighted-average assumptions, including the most sensitive input, volatility:
September 30, 2022December 31, 2021
Risk-free interest rate
4.20%1.22%
Volatility
100.00%94.00%
Expected term (years)
3.884.64
The following table reflects the fair value roll forward reconciliation of the warrant derivative liabilities for the period ended September 30, 2022:
(in thousands)Warrant Derivative Liability
Balance, December 31, 2021
$2,773 
Change in fair value(827)
Balance, September 30, 2022
$1,946 
Summary of Warrants Outstanding and Exercisable
A summary of warrants outstanding and exercisable as of September 30, 2022 is as follows:

Year IssuedWarrants Outstanding and ExercisableWeighted Average Remaining
Contractual Life
Weighted Average Exercise Price
(in years)(per share)
20195,750,0003.88$13.00 
20204,149,3783.10$6.50 
202011,659,752$— 
20212,055,9206.19$1.69 
2021220,559,210$— 
34,174,260