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Leases (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Leases [Abstract]

Schedule of Finance and Operating Lease Assets and Lease Liabilities

Finance and operating lease assets and lease liabilities are as follows:

Lease Classification		Classification		Three months ended March 31, 2024				Year-ended December 31, 2023
Assets
Current
Operating		Current assets		$	—			$	—
Finance		Current assets			1				1
Long-term
Operating		Long-term assets			2,200				2,262
Finance		Long-term assets			37				43
Total right-of-use assets				$	2,238			$	2,306
Liabilities
Current
Operating		Short-term lease liability		$	219			$	222
Finance		Short-term lease liability			6				6
Noncurrent
Operating		Long-term lease liability			2,057				2,111
Finance		Long-term lease liability			90				94
Total lease liabilities				$	2,372			$	2,433

Finance and operating lease assets and lease liabilities are as follows:

Lease Classification		Classification		December 31, 2023				December 31, 2022
Assets
Current
Operating		Current assets		$	—			$	—
Finance		Current assets			1				1
Long-term
Operating		Long-term assets			2,262				2,454
Finance		Long-term assets			43				96
Total right-of-use assets				$	2,306			$	2,551
Liabilities
Current
Operating		Short-term lease liability		$	222			$	205
Finance		Short-term lease liability			6				377
Noncurrent
Operating		Long-term lease liability			2,111				2,300
Finance		Long-term lease liability			94				98
Total lease liabilities				$	2,433			$	2,980

Schedule of Lease Expense

The components of lease expense were as follows:

		Three Months Ended
		March 31, 2024				March 31, 2023
Operating lease expense		$	109			$	104
Finance lease expense
Amortization on ROU assets			9				35
Interest on lease liabilities			1				11
Short-term lease expense			15				15
Total lease expense		$	134			$	165

The components of lease expense were as follows:

		Year Ended
		December 31, 2023				December 31, 2022
Operating lease expense		$	440			$	412
Finance lease expense
Amortization on ROU assets			55				192
Interest on lease liabilities			14				59
Short-term lease expense			61				86
Total lease expense		$	570			$	749

Schedule of Other Information Related to Leases

Other information related to leases was as follows:

		Three Months Ended
		March 31, 2024				March 31, 2023
Weighted average remaining lease term (in years)
Operating leases			7.6				8.5
Finance leases			1.7				2.7
Weighted average discount rate:
Operating leases			8.1	%			8.1	%
Finance lease			4.6	%			4.6	%

		Three Months Ended
		March 31, 2024				March 31, 2023
Cash paid for amounts included in measurement of lease liabilities
Operating cash flows from operating leases		$	104			$	103
Operating cash flows from finance leases		$	2			$	10
ROU assets obtained in exchange for lease obligations
Operating leases		$	—			$	72
Finance lease		$	—			$	—

Other information related to leases was as follows:

		Year Ended
		December 31, 2023				December 31, 2022
Weighted average remaining lease term (in years)
Operating leases			7.8				8.8
Finance leases			1.9				0.8
Weighted average discount rate:
Operating leases			8.1	%			8.0	%
Finance lease			4.6	%			12.7	%

		Year Ended
		December 31, 2023				December 31, 2022
Cash paid for amounts included in measurement of lease liabilities
Operating cash flows from operating leases		$	423			$	222
Operating cash flows from finance leases		$	16			$	45
ROU assets obtained in exchange for lease obligations
Operating leases		$	55			$	1,375
Finance lease		$	—			$	47

Schedule of Future Minimum Lease Payments Under Non-Cancellable Leases

Future minimum lease payments under non-cancellable leases as of March 31, 2024 were as follows:

Year		Operating Leases				Finance Leases
2024		$	297			$	6
2025			371				32
2026			367				65
2027			412				—
2028			412				—
Thereafter			1,220				—
Total future minimum lease payments			3,079				103
Less: imputed interest			(803	)			(8	)
Total			2,276				95
Plus: lease asset, current			—				1
Less: lease liability, current			(219	)			(6	)
Total long-term lease liability		$	2,057			$	90

Future minimum lease payments under non-cancellable leases as of December 31, 2022 were as follows:

Year		Operating Leases				Finance Leases
2024		$	402			$	10
2025			371				32
2026			367				65
2027			412				—
2028			412				—
Thereafter			1,220				—
Total future minimum lease payments			3,184				107
Less: imputed interest			(851	)			(8	)
Total			2,333				99
Plus: lease asset, current			—				1
Less: lease liability, current			(222	)			(6	)
Total long-term lease liability		$	2,111			$	94

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Schedule of finance and operating lease assets and lease liabilities.

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Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

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