Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of stock option activities

	June 30, 2023
	Number of Options			Weighted Average
	(In thousands)			Exercise Price
Outstanding at beginning of year		668		$	5.22
Granted		626			1.25
Exercised		(72	)		0.48
Forfeited		(167	)		4.37
Expired		(42	)		8.19
Outstanding on June 30, 2023		1,013		$	3.12
Options exercisable on June 30, 2023		368		$	4.61

Valuation assumptions for stock-based compensation

	For Three Months Ended June 30, 2023		For Three Months Ended June 30, 2022		For Six Months Ended June 30, 2023		For Six Months Ended June 30, 2022
Weighted average grant date fair value	$	1.09	$	–	$	1.08	$	3.34
Weighted average assumptions used:
Expected dividend yield		0.0%		0.0%		0.0%		0.0%
Risk-free interest rate		3.53%		0.0%		3.68%		0.88%
Expected volatility		103.2%		0.0%		114.1%		133.0%
Expected life (in years)		6.4		–		6.4		6.6