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Grant Revenue - Additional Information (Details) - CPRIT Contract [Member] - USD ($)
 3 Months Ended 6 Months Ended
Sep. 19, 2022
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]              
Grant funding term 3 years            
CPRIT grant funding term, description           The CPRIT Grant is subject to customary CPRIT funding conditions, including, but not limited to, a matching fund requirement (one dollar for every two dollars awarded by CPRIT), revenue sharing obligations upon commercialization of rhenium (186Re) obisbemeda based on specific dollar thresholds and tiered low single digit royalty rates until CPRIT receives the aggregate amount of 400% of the proceeds awarded under the CPRIT Grant, and certain reporting requirements.  
Contract effective date Aug. 31, 2022            
Contract termination date Aug. 30, 2025            
Percentage of aggregate amount of proceeds awarded under CPRIT grant 400.00%            
Percentage of grant proceeds with interest not exceed annually 5.00%            
Identified eligible reimbursable costs     $ 168,000 $ 637,000      
Increase in grant revenue   $ 805,000          
Grant [Member]              
Disaggregation of Revenue [Line Items]              
Revenue recognized   $ 1,900,000     $ 0 $ 2,400,000 $ 0