Quarterly report pursuant to Section 13 or 15(d)


Cover - shares
3 Months Ended
Mar. 31, 2024
Apr. 26, 2024
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Mar. 31, 2024  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Entity Information [Line Items]    
Entity Central Index Key 0001388320  
Entity File Number 001-36374  
Entity Tax Identification Number 74-2963609  
Entity Incorporation, State or Country Code DE  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 100 Park Ave., 23rd Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10017  
Entity Phone Fax Numbers [Line Items]    
City Area Code (646)  
Local Phone Number 677-3870  
Entity Listings [Line Items]    
Title of 12(b) Security Common stock, par value $0.001  
Trading Symbol ATNM  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   29,783,451