Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2023

Stock-Based Compensation [Abstract]

Schedule of stock option activity

	Options			Weighted Average Exercise Price
Outstanding at January 1, 2023		7,472,056		$	4.23
Granted		-		$	-
Exercised		-		$	-
Cancelled (expired)		(294,451	)	$	6.43
Outstanding at March 31, 2023		7,177,605		$	4.14

Schedule of stock-based compensation expense

	Three Months Ended March 31,
	2023		2022
General and administrative	$	1,105	$	1,294
Research and development		117		249
Total stock-based compensation	$	1,222	$	1,543