Leases (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2024

Dec. 31, 2023

Leases [Abstract]

Schedule of effect of lease costs in the company's consolidated statement of operations and comprehensive loss

The following table sets forth information about lease costs for the three months ended March 31, 2024 and 2023 (in thousands):

	Three Months Ended March 31,
Finance lease cost	2024		2023
Amortization of ROU assets	$	114	$	134
Interest on lease liabilities		31		42
Operating lease cost		351		351
Short-term lease cost		176		150
Variable lease cost		249		206
Total lease costs	$	921	$	883

The following table sets forth information about lease costs for the years ended December 31, 2023 and 2022 (in thousands):

	Year Ended December 31,
Finance lease cost	2023		2022
Amortization of ROU assets	$	488	$	359
Interest on lease liabilities		151		106
Operating lease cost		1,404		1,404
Short-term lease cost		749		389
Variable lease cost		786		907
Sublease income		—		(253	)
Total lease costs	$	3,578	$	2,912

Schedule of information about the company's leases

The following table sets forth information about the Company’s leases for the three months ended March 31, 2024 and 2023 (in thousands):

	Three Months Ended March 31,
Cash paid for amounts included in the measurement of lease liabilities	2024			2023
Finance leases - financing cash flows	$	118		$	144
Finance leases - operating cash flows		31			42
Operating leases - operating cash flows		381			370
Weighted-average remaining lease terms (in years)
Finance leases		2.99			3.97
Operating leases		1.84			2.84
Weighted-average discount rate
Finance leases		9.65	%		9.54	%
Operating leases		8.25	%		8.25	%

The following table sets forth information about the Company’s leases for the years ended December 31, 2023 and 2022 (in thousands):

	Year Ended December 31,
Cash paid for amounts included in the measurement of lease liabilities	2023			2022
Finance leases - financing cash flows	$	499		$	393
Finance leases - operating cash flows		151			106
Operating leases - operating cash flows		1,235			1,470
ROU assets obtained in exchange for lease liabilities
Finance leases		—			1,340
Weighted-average remaining lease terms (in years)
Finance leases		3.23			4.19
Operating leases		2.09			3.09
Weighted-average discount rate
Finance leases		9.62	%		9.49	%
Operating leases		8.25	%		8.25	%

Schedule in tabular form of maturity of operating and finance leases

The following table presents the maturity of the Company’s finance and operating lease liabilities for the three months ended March 31, 2024 (in thousands):

Year ended December 31,	Finance Leases			Operating Leases
2024 (remaining)	$	434		$	1,154
2025		552			1,580
2026		363			132
2027		44			—
2028		—			—
Thereafter		—			—
Total lease payments		1,393			2,866
Less: interest		(160	)		(198	)
Total lease liabilities	$	1,233		$	2,668

The following table presents the maturity of the Company’s finance and operating lease liabilities for the year ended December 31, 2023 (in thousands):

Year ended December 31,	Finance Leases			Operating Leases
2024	$	583		$	1,534
2025		552			1,580
2026		363			132
2027		44			—
2028		—			—
Thereafter		—			—
Total lease payments		1,542			3,246
Less: interest		(191	)		(254	)
Total lease liabilities	$	1,351		$	2,992