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Balance Sheet Details (Accounts payable and accrued liabilities) (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Balance Sheet Details    
Accounts payable $ 3,772,000 $ 1,678,000
Accrued clinical trial expenses 1,879,000 2,650,000
Other accrued expenses 1,049,000 1,706,000
Accounts Payable and Accrued Liabilities, Current, Total $ 6,700,000 $ 6,034,000