Stock Options and Stock Grants (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest.

We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest. 

	Years ended   December 31,
	2023		2022
Share-based compensation expense	$	773	$	625
Remaining unrecognized compensation expense	$	1,118		1,732
Remaining weighted average-period, expense recognition (years)		1.8		2.5

The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented:

The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented:

	Years Ended December 31,
	2023			2022
Weighted-average risk-free interest rates:		3.8	%		3.5	%
Dividend yield:		0	%		0	%
Weighted-average expected life (years) of the option:		4			5
Weighted-average expected stock price volatility:		93	%		116	%
Weighted-average fair value of the options granted:	$	0.50		$	0.97

Additional disclosures for options granted for all years presented:

Additional disclosures for options granted for all years presented:

	Years Ended December 31,
	2023			2022
Vesting period (years) of shares granted in period		3			3
Contractual life (years) of shares granted in period		7			7
Estimated forfeitures		8	%		4	%

The following table summarizes the option activity for our employees and directors during the year ended December 31, 2023:

The following table summarizes the option activity for our employees and directors during the year ended December 31, 2023:

						Weighted
				Weighted		Average		Aggregate
				Average		Remaining		Intrinsic
	Shares			Exercise Price		Contractual		Value
Options	(Rounded)			per Share		Term (Years)		(000s)
Outstanding on January 1, 2023		3,443,661		$	1.33		4.9		1,230
Granted		668,200		$	0.68
Exercised		(294,074	)	$	0.50
Forfeited or expired		(291,821	)	$	1.92
Outstanding on December 31, 2023		3,525,966		$	1.22		4.2	$	160
Exercisable on December 31, 2023		2,334,458		$	1.15		3.2	$	160
Shares available for grant		450,900

The aggregate intrinsic value in the table above is based on our closing stock price of $0.60

The aggregate intrinsic value in the table above is based on our closing stock price of $0.60 on the last business day for the year ended December 31, 2023.

	Years ended   December 31,
	2023		2022
Shares exercised		294,074		414,455
Total intrinsic value	$	195	$	942
Cash received	$	154	$	182