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Facility Lease - Lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating lease cost
Total operating lease cost	$ 418	$ 414	$ 1,226	$ 987
Other Information
Operating cash flows used for operating lease	$ 459	$ 433	$ 1,378	$ 1,265
Remaining lease term	1 year 3 months 18 days	2 years 3 months 18 days	1 year 3 months 18 days	2 years 3 months 18 days
Discount rate	8.00%	8.00%	8.00%	8.00%
Research and development
Operating lease cost
Operating lease costs	$ 306	$ 306	$ 918	$ 746
Costs of non-lease components (previously common area maintenance)	$ 112	$ 108	$ 308	$ 241

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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