Warrants (Tables)

12 Months Ended

Dec. 31, 2020

Warrants And Rights Note Disclosure [Abstract]

Schedule of Range of Significant Unobservable Inputs Used in Measurement of Fair Value of Warrants

The fair value of the Public Warrants was determined using the readily observable publicly traded price (Level 1) as of the end of each reporting period and the Private Placement Warrants were estimated utilizing a binomial lattice model using the following range of significant unobservable inputs (Level 3) for the respective periods:

	2020	2019
Stock price	$2.15 - $3.20	$5.75 - $8.84
Volatility	60.1% - 71.9%	36.8% - 44.4%
Risk-free rate	0.16% - 0.31%	1.55% - 2.21%
Dividend yield	8.17% - 9.00%	7.58% - 10.30%
Term	2.65 - 3.40 years	3.65 - 4.40 years

Schedule of Reconciliation of Beginning and Ending Balance for Liabilities Measured at Fair Value on Recurring Basis

The following is a reconciliation of the beginning and ending balance for the liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the years ended December 31, 2020, 2019 and 2018 (in thousands):

	Level 3
	Warrant Liability
Fair value of warrant liability at August 23, 2018, time of Transactions	$	42,500
Increase (decrease) in fair value		(27,800	)
Fair value of warrant liability at December 31, 2018	$	14,700
Increase (decrease) in fair value		(6,069	)
Fair value of warrant liability at December 31, 2019	$	8,631
Increase (decrease) in fair value		(5,128	)
Fair value of warrant liability at December 31, 2020	$	3,503