Stock-Based Compensation Plan (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Option activity under the Plans for the year ended December 31, 2019, was as follows (in thousands, except as noted):

				Weighted
		Weighted-		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
		(per share)		(in years)
Year Ended December 31, 2019
Outstanding at December 31, 2018	37	$	112.60	7.5	$	—
Granted	35		18.40	9.2
Forfeited	(3)		36.68
Expired	(1)		61.18
Outstanding at December 31, 2019	68	$	68.56	7.7	$	—
Vested and expected to vest December 31, 2019	58	$	76.12	7.4	$	—
Exercisable at December 31, 2019	26	$	138.77	5.5	$	—

Option activity under the Plans for the year ended December 31, 2018, was as follows (in thousands, except as noted):

				Weighted
		Weighted-		Average
		Average		Remaining	Aggregate
		Exercise		Contractual	Intrinsic
	Options	Price		Term	Value
		(per share)		(in years)
Year Ended December 31, 2018
Outstanding at December 31, 2017	32	$	232.00	4.0	$	—
Granted	20		34.60	9.3
Forfeited	—		—
Expired	(15)		267.20
Outstanding at December 31, 2018	37	$	112.60	7.5	$	—
Vested and expected to vest December 31, 2018	31	$	124.60	7.2	$	—
Exercisable at December 31, 2018	15	$	181.00	5.1	$	—

Warrant [Member]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

For stock options granted during 2019 and 2018 the following weighted average assumptions were used in determining fair value:

	2019		2018
Risk-free interest rate	2.23	%	2.70	%
Expected volatility	126	%	90	%
Expected term in years	6.0		6.1
Dividend yield	—	%	—	%