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Leases (Tables)
 9 Months Ended
Sep. 30, 2023
Leases [Abstract]  
Schedule of components of lease expense and supplemental cash flow information
The components of lease expense and supplemental cash flow information are as follows (in thousands):
Three months ended September 30,Nine months ended September 30,
2023202220232022
Operating lease expense$890 $217 $2,625 $880 
Finance lease expense:
Amortization of assets3 4 11 11 
Interest on lease liabilities1 1 3 5 
Total finance lease expense 4 5 14 16 
Short-term lease expense138 76 160 341 
Total lease expense$1,032 $298 $2,799 $1,237 
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$1,331 $461 $4,246 $1,186 
Operating cash flows from finance leases7 10 24 32 
Financing cash flows from finance leases1 1 3 5 
Schedule of maturities of operating leases liabilities
Maturities of lease liabilities as of September 30, 2023 are as follows (in thousands):
Years ending December 31,Operating LeasesFinance Leases
2023 (excluding the nine months ended September 30, 2023)
$985 $10 
20242,909 22 
20251,696 — 
20261,732 — 
20271,660 — 
Thereafter4,334 — 
Total lease payments$13,316 $32 
Less: Interest(3,032)(1)
Present value of lease liabilities$10,284 $31 
Schedule of maturities of finance leases liabilities
Maturities of lease liabilities as of September 30, 2023 are as follows (in thousands):
Years ending December 31,Operating LeasesFinance Leases
2023 (excluding the nine months ended September 30, 2023)
$985 $10 
20242,909 22 
20251,696 — 
20261,732 — 
20271,660 — 
Thereafter4,334 — 
Total lease payments$13,316 $32 
Less: Interest(3,032)(1)
Present value of lease liabilities$10,284 $31 
Schedule of supplemental balance sheet information
Supplemental balance sheet information related to leases is as follows (in thousands):
September 30, 2023December 31, 2022
Operating Leases
Operating lease right-of-use assets$5,131 $5,900 
Current portion of operating lease liabilities2,747 3,328 
Long-term operating lease liabilities7,537 8,044 
Total operating lease liabilities$10,284 $11,372 
Finance Leases
Property and equipment$147 $147 
Accumulated depreciation(66)(55)
Property and equipment, net$81 $92 
Current portion of finance lease liabilities$31 $36 
Long-term finance lease liabilities— 19 
Total finance lease liabilities$31 $55 
Weighted Average Remaining Lease Term
Operating leases4.6 years5.3 years
Finance leases0.8 years1.6 years
Weighted Average Discount Rate
Operating leases9.2 %9.3 %
Finance leases8.5 %8.9 %
Schedule of Future Sublease Rental Income
Sublease Income
On April 1, 2023, the Company entered into an agreement to sublease its office and lab space in Houston, Texas beginning September 1, 2023 and continuing until October 30, 2030. The rental income from the sublease is included in the Company’s statement of operations in Other income (expense), net, and offsets the rental expense from the Company’s lease of the facility from the landlord. Sublease rental income for future years are as follows (in thousands):
Years ending December 31,Rental Income
2023 (excluding the nine months ended September 30, 2023)
$192 
2024767 
2025767 
2026767 
2027767 
Thereafter2,173 
Total rental income$5,433