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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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)	2019		2018
Selling, general and administrative	$	1,387	$	1,958
Research and development		125		129
Total	$	1,512	$	2,087

Summary of Plan Stock Option Activity

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

	2019					2018
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Beginning Balance		140,546		$	61.25		2,562		$	1,049.93
Granted		281,834			2.38		163,997			45.76
Exercised		—			—		—			—
Forfeited/expired		(16,650	)		31.77		(26,013	)		61.01
Outstanding at December 31		405,730		$	21.56		140,546		$	61.25
Vested at December 31		72,377		$	74.21		16,206		$	169.07

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:

	2019			2018
Expected dividend yield		0	%		0	%
Risk-free interest rate		1.85	%		2.49	%
Expected volatility		121.67	%		120.54	%
Expected life (in years)		6.22			6.23

Summary of Restricted Stock Award Activity

The following table summarizes restricted stock award activity during 2019 and 2018:

	2019					2018
	RSUs			Weighted Average Grant Price		RSUs			Weighted Average Grant Price
Nonvested, beginning balance		3		$	7,297.22		15		$	7,297.22
Granted		—			—		—			—
Vested		(3	)	$	7,297.22		(12	)		7,297.22
Forfeited		—			—		—			—
Nonvested at December 31		—			—		3		$	7,297.22