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Balance Sheet Details (Accounts Payable and Accrued Liabilities) (Details) - USD ($)
Dec. 31, 2022
Dec. 31, 2021
Balance Sheet Details    
Accounts payable $ 1,678,000 $ 1,138,000
Accrued clinical trial expenses 2,650,000 529,000
Other accrued expenses 1,706,000 603,000
Accounts Payable and Accrued Liabilities, Current, Total $ 6,034,000 $ 2,270,000