Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

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)	2020		2019
Selling, general and administrative	$	1,252	$	1,387
Research and development		97		125
Total	$	1,349	$	1,512

Summary of Plan Stock Option Activity

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

	2020					2019
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Beginning Balance		13,471		$	515.33		4,638		$	1,461.24
Granted		5,542			10.03		9,374			71.40
Exercised		—			—		—			—
Forfeited/expired		(2,124	)		71.51		(541	)		926.31
Outstanding at December 31		16,889		$	405.34		13,471		$	515.33
Vested at December 31		7,254		$	697.37		2,383		$	1,417.42

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:

	2020			2019
Expected dividend yield		0	%		0	%
Risk-free interest rate		0.65	%		1.85	%
Expected volatility		127.87	%		121.67	%
Expected life (in years)		5.91			6.22