Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of fair value of pre-funded warrants and other warrants

Warrant Type	Valuation Date	Exercise Price		Volatility			Risk Free Interest Rate			Term (years)		Fair Value
Pre-funded	10/28/2020	$	0.01		97.0	%		0.34	%		5.00	$	23,638
Other	10/28/2020	$	9.76		134.0	%		0.14	%		1.50	$	27,048
Pre-funded	11/16/2020	$	0.01		97.0	%		0.40	%		4.95	$	21,916
Other	11/24/2020	$	9.76		135.0	%		0.13	%		1.45	$	31,231

Schedule of fair values of warrants based on unobservable inputs

	Warrants to Senior Note holders			Pre-funded Warrants			Other Warrants
Balance, December 31, 2019	$	977		$	—		$	—
Issuance of warrants in October 2020 offering		—			23,638			27,048
Exercise of warrants/reclass to equity in 2020		(8,474	)		(21,917	)		(31,231	)
Adjustments to fair value for 2020		7,497			(1,721	)		4,183
Balance, December 31, 2021 and 2022	$	—		$	—		$	—

Schedule of recurring and nonrecurring fair value measurements

									Benefit Plan
	Fair								Percentage
	Value		Level 1		Level 2		Level 3		Allocation
Assets:
Derivative financial instruments	$	4,973	$	4,973	$	—	$	—
Defined benefit plan assets(1) (pooled separate accounts):
Large U.S. Equity(2)		4,586		—		4,586		—		28	%
Small/Mid U.S. Equity(3)		2,986		—		2,986		—		18	%
International Equity(4)		2,406		—		2,406		—		14	%
Fixed Income(5)		6,710		—		6,710		—		40	%
	$	21,661	$	4,973	$	16,688	$	—
Liabilities:
Derivative financial instruments	$	6,732	$	6,732	$	—	$	—

									Benefit Plan
	Fair								Percentage
	Value		Level 1		Level 2		Level 3		Allocation
Assets:
Derivative financial instruments	$	15,839	$	15,839	$	—	$	—
Long-lived assets held-for-sale		1,000		—		—		1,000
Defined benefit plan assets(1) (pooled separate accounts):
Large U.S. Equity(2)		5,612		—		5,612		—		28	%
Small/Mid U.S. Equity(3)		3,684		—		3,684		—		18	%
International Equity(4)		2,909		—		2,909		—		15	%
Fixed Income(5)		7,782		—		7,782		—		39	%
	$	36,826	$	15,839	$	19,987	$	1,000
Liabilities:
Derivative financial instruments	$	13,582	$	13,582	$	—	$	—

(1) See Note 11 for accounting discussion.

(2) This category includes investments in funds comprised of equity securities of large U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.

(3) This category includes investments in funds comprised of equity securities of small- and medium-sized U.S. companies. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.

(4) This category includes investments in funds comprised of equity securities of foreign companies, including emerging markets. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.

(5) This category includes investments in funds comprised of U.S. and foreign investment-grade fixed income securities, high-yield fixed income securities that are rated below investment-grade, U.S. treasury securities, mortgage-backed securities, and other asset-backed securities. The funds are valued using the net asset value method in which an average of the market prices for the underlying investments is used to value the fund.