Fair Value (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Schedule of Assumptions to Estimate Fair Value of Warrants

The Company utilized the following assumptions to estimate the fair value of the February 2017 Warrants:

	December 31,			December 31,
	2021			2020
Underlying price per share	$	0.92		$	1.79
Exercise price per share	$	30.25-$33.00		$	30.25-$33.00
Risk-free interest rate		0.22%-0.23	%		0.126	%
Expected holding period		0.58-0.60			1.58-1.60
Expected volatility		45	%		160	%
Expected dividend yield		—			—

The Company utilized the following assumptions to estimate the fair value of the June 2017 Warrants:

	December 31,			December 31,
	2021			2020
Underlying price per share	$	0.92		$	1.79
Exercise price per share	$	27.50		$	27.50
Risk-free interest rate		0.15	%		0.11	%
Expected holding period		0.42			1.42
Expected volatility		50	%		175	%
Expected dividend yield		—			—

The Company utilized the following assumptions to estimate the fair value of the August 2017 Warrants:

	December 31,			December 31,
	2021			2020
Underlying price per share	$	0.92		$	1.79
Exercise price per share	$	19.80		$	19.80
Risk-free interest rate		0.06	%		0.11	%
Expected holding period		0.18			1.18
Expected volatility		65	%		165	%
Expected dividend yield		—			—

The Company utilized the following assumptions to estimate the fair value of the April 2018 Warrants:

	December 31,			December 31,
	2021			2020
Underlying price per share	$	0.92		$	1.79
Exercise price per share	$	17.16		$	17.16
Risk-free interest rate		0.67	%		0.16	%
Expected holding period		1.81			2.81
Expected volatility		120	%		130	%
Expected dividend yield		—			—

The Company utilized the following assumptions to estimate the fair value of the March 2019 Warrants:

	December 31,			December 31,
	2021			2020
Underlying price per share	$	0.92		$	1.79
Exercise price per share	$	8.80		$	8.80
Risk-free interest rate		0.78	%		0.19	%
Expected holding period		2.19			3.19
Expected volatility		125	%		125	%
Expected dividend yield		—			—

Schedule of Range of Probabilities

With the above factors utilized in analysis of the likelihood of the Put’s potential Liability, the Company estimated the range of probabilities related to a Put right being triggered as:

Range of Probability	Probability
Low		0.5	%
Medium		1.0	%
High		5.0	%

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The table below presents the balances of assets and liabilities measured at fair value on a recurring basis by level within the hierarchy as:

	(in thousands) As of December 31, 2021
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	16,175	$	16,175	$	—	$	—
Liabilities:
Redeemable warrants	$	35		—		—	$	35

	(in thousands) As of December 31, 2020
	Total		Level 1		Level 2		Level 3
Assets:
Marketable securities	$	15,877	$	15,877	$	—	$	—
Liabilities:
Redeemable warrant	$	180		—		—	$	180

Schedule of Changes in Level 3 Liabilities Measured at Fair Value on a Recurring Basis

The changes in Level 3 Liabilities measured at fair value on a recurring basis are summarized as follows (in thousands):

Redeemable warrants:
Balance at December 31, 2020	$	180
Fair value adjustments		(145	)
Balance at December 31, 2021	$	35

Schedule of Assets and Liabilities Measured at Fair Value on a NonRecurring Basis

The table below presents the balances of assets and liabilities measured at fair value on a nonrecurring basis by level within the hierarchy as:

	(in thousands) As of December 31, 2021
	Total		Level 1		Level 2		Level 3		Total Gains (Losses)
Assets:
Long lived assets held and used(a)	$	3,900	$	—	$	—	$	3,900	$	1,800

(a) In accordance with Subtopic 360-10, long-lived assets held and used with a carrying amount of $5,700,000 were written down to their fair value of $3,900,000, resulting in an impairment charge of $1,800,000, which is included in earnings for the period.