Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2020

Stockholders Equity Note [Abstract]

Summary of Stock Option Activity

The following is a summary of stock option activity under the Plan for the six months ended June 30, 2020:  

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2019		1,640	$	196.70	9.1	$	—
Granted		—
Exercised		—
Cancelled/Forfeited		—
Outstanding at June 30, 2020		1,640	$	196.70	8.6	$	—
Exercisable at June 30, 2020		1,640	$	196.70	8.6	$	—

Summary of Recognized Share-based Compensation Cost

The following is a summary of share-based compensation expense in the statement of operations:

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2020		2019		2020		2019
Selling, general and administrative	$	606	$	58	$	655	$	106
Research and development		—		17		5		27
Total	$	606	$	75	$	660	$	133

Summary of Warrant Activity

The following is a summary of warrant activity for the six months ended June 30, 2020:

	Warrants			ExercisePriceper Share	Weighted Average Exercise Price		Weighted Average RemainingLife (Years)
Outstanding at December 31, 2019		1,826,608		$7.00 - $23.04	$	23.04		5.0
Issued		2,601,900				10.00
Exercised		(6,000	)			0.01
Expired		(9	)			7.00
Outstanding at June 30, 2020		4,422,499		$0.01- $10.00	$	9.16		4.7