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Liquidity (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Jun. 22, 2023
Subsidiary, Sale of Stock [Line Items]          
Net loss $ 2,191,000 $ 6,397,000 $ 4,093,000 $ 14,137,000  
Net cash provided by (used in) operating activities     6,072,000 $ (11,030,000)  
Unrestricted cash and cash equivalents 26,300,000   26,300,000    
Shelf registration          
Subsidiary, Sale of Stock [Line Items]          
Sale of securities, authorized amount         $ 125,000,000
ATM Facility          
Subsidiary, Sale of Stock [Line Items]          
Sale of securities, authorized amount         $ 47,800,000
Available amount remaining under ATM facility 47,800,000   47,800,000    
Western Alliance Bank          
Subsidiary, Sale of Stock [Line Items]          
Line of credit maximum capacity 10,000,000   10,000,000    
Line of credit current availability 4,900,000   4,900,000    
Line of credit outstanding borrowings $ 0   $ 0