Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-Based Compensation [Abstract]

Summary of Stock-Based Compensation Expense

The following table summarizes the stock-based compensation expense which was recognized in the consolidated statements of operations for the years ended December 31,

(Dollars in thousands)	2021		2020
Selling, general and administrative	$	1,171	$	1,252
Research and development		143		97
Total	$	1,314	$	1,349

Summary of Plan Stock Option Activity

The following is a summary of the Plans’ stock option activity during the years ended December 31:

	2021					2020
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Beginning Balance		16,889		$	405.34		13,471		$	515.33
Granted		912,999			4.46		5,542			10.03
Exercised		—			—		—			—
Forfeited/expired		(175,363	)		27.76		(2,124	)		71.51
Outstanding at December 31		754,525		$	8.00		16,889		$	405.34
Vested at December 31		43,691		$	64.16		7,254		$	697.37

Weighted Average Assumptions used in Black-Scholes Option Pricing Model

The following table provides the weighted average assumptions used in the Black-Scholes option pricing model for the years ended December 31:

	2021			2020
Expected dividend yield		0	%		0	%
Risk-free interest rate		1.19	%		0.65	%
Expected volatility		131.03	%		127.87	%
Expected life (in years)		6.21			5.91