Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 25, 2022
Jun. 30, 2021
Document Information Line Items      
Trading Symbol ATNM    
Document Type 10-K    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   22,143,974  
Entity Public Float     $ 138,622,140
Amendment Flag false    
Entity Central Index Key 0001388320    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-52446    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-2963609    
Entity Address, Address Line One 275 Madison Avenue, 7th Fl.    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10016    
City Area Code (646)    
Local Phone Number 677-3870    
Title of 12(b) Security Common stock, par value $0.001    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Auditor Name Marcum llp    
Auditor Location Houston, Texas    
Auditor Firm ID 688