Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Components of Share-based Compensation Expense

The following table summarizes the components of share-based compensation expense in the Condensed Consolidated Statements of Operations for the three and six-month periods ended June 30, 2021 and 2020:

	Three Months Ended June 30,				Six Months Ended June 30,
Dollars in thousands	2021		2020		2021		2020
Cost of goods sold	$	25	$	12	$	45	$	35
Selling, general and administrative	110		151		158		615
Research and development	5		4		7		8
Total non-cash compensation expense related to share-based compensation included in operating expense	$	140	$	167	$	210	$	658

Schedule of Valuation Assumptions

The fair value of each stock option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses assumptions noted in the following table. Expected volatilities and risk-free interest rates are based upon the expected life of the grant.

	Six Months Ended June 30,
Assumptions	2021	2020
Expected dividends	—	—
Risk-free rate	0.19% - 0.22%	0.85% - 1.60%
Expected volatility	165.43% - 166.02%	78.56% - 79.58%
Expected term (in years)	3.20 - 3.30	3.20 - 3.30

Schedule of Stock Option Activity

A summary of option activity under the 1999 Director Stock Option Plan, 2009 Equity Incentive Plan, and the 2016 Equity Incentive Plan as of June 30, 2021 and changes during the period are presented below:

	Number of Options	Weighted Average Exercise Price
Outstanding as of January 1, 2021	507,295	$	18.31
Granted	1,994,120	0.82
Exercised	—	—
Forfeited	(9,562)	13.41
Expired	(34,560)	28.41
Outstanding as of June 30, 2021	2,457,293	$	4.42
Exercisable as of June 30, 2021	236,838	$	30.69

Schedule of Stock Options Outstanding and Exercisable

The following tables summarize information regarding options outstanding and exercisable at June 30, 2021:

Outstanding:

	Stock Options	Weighted Average		Weighted Average Remaining
Range of Exercise Prices	Outstanding	Exercise Price		Contractual Life
$0.00 - $7.80	2,285,167	$	1.15	9.58
$7.81 - $15.00	49,941	10.27		6.00
$15.10 - $55.00	58,020	26.49		6.57
$55.10 - $106.70	64,165	79.24		4.54
Total	2,457,293	$	3.98	9.31

Exercisable: 

Range of Exercise Prices	Stock Options Exercisable	Weighted Average Exercise Price
$0.00 - $7.80	76,479	$	4.40
$7.81 - $15.00	48,035	10.32
$15.10 - $55.00	48,159	28.07
$55.10 - $106.70	64,165	79.24
Total	236,838	$	30.69

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes the activity related to the Company's restricted stock and RSUs for the six months ended June 30, 2021.

	Number of RSUs	Weighted Average Grant Date Fair Value
Non-vested balance at January 1, 2021	23,686	$	2.59
Changes during the period:
Shares granted	1,627,038	0.78
Shares vested	(181)	35.30
Shares forfeited	(63,530)	0.82
Non-vested balance at June 30, 2021	1,587,013	$	0.80