STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

Schedule of stock option activity

The following table presents the outstanding stock option activity:

	Number of Options		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (years)
Three months ended June 30, 2024:
Outstanding as of March 31, 2024	3,641		$	1,194.90	3.8
Granted	892		6.740		4.8
Outstanding as of June 30, 2024	4,533	(1)	899.48		3.8
Six months ended June 30, 2024:
Outstanding as of December 31, 2023	3,643		1,197.00		4.0
Granted	892		6.740		4.8
Forfeited	(2)		1,965.36		3.0
Outstanding as of June 30, 2024	4,533	(1)	899.48		3.8
Exercisable as of June 30, 2024	3,987		1,009.40		3.8

(1) Includes options related to 823 shares that are inducement awards and not granted under the 2018 Plan.

Schedule of fair value of options granted, assumptions

The weighted average grant date fair value of options granted during the three months ended June 30, 2024 was $5.59 per share, based on the following assumptions used in the Black-Scholes option pricing model:

Expected volatility	117.0	%
Expected dividend yield	—
Expected term (in years)	5
Risk-free interest rate	4.43	%

Schedule of stock-based compensation expense

The stock-based compensation expense was recorded as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
Research and development	$	4	$	5	$	8	$	9
Selling, general and administrative (1)	84		165		165		327
Total stock-based compensation expense	$	88	$	170	$	173	$	336

(1) Includes $56,000 related to stock issued in exchange for marketing services for the three and six month periods ended June 30, 2023.