PUBLIC OFFERING AND PRIVATE PLACEMENT (Tables)

12 Months Ended

Dec. 31, 2021

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:

	December 31, 2021		December 31, 2020
Risk-free interest rate	1.22	%	0.46	%
Volatility	94	%	90	%
Expected life (years)	4.64		5.64

The following table reflects the fair value roll forward reconciliation of the 2019 Public Warrants liabilities for the period ended December 31, 2021:

(in thousands)	Warrant Derivative Liability
Balance, December 31, 2020	$	10,345
Change in fair value	(7,572)
Balance, December 31, 2021	$	2,773

Summary of Warrants Outstanding and Exercisable

A summary of warrants outstanding and exercisable as of December 31, 2021 is as follows:

	Warrants Outstanding				Warrants Exercisable
Year Issued	Number Outstanding	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Number Exercisable	Weighted Average Exercise Price
		(in years)	(per share)			(per share)
2019	5,750,000	4.64	$	13.00	5,750,000	$	13.00
2020	4,149,378	3.84	$	6.50	4,149,378	$	6.50
20201	1,716,702	—	$	—	1,716,702	$	—
2021	2,055,920	6.94	$	1.69	2,055,920	$	1.69
20212	20,559,210	—	$	—	20,559,210	$	—
	34,231,210				34,231,210