Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

Document And Entity Information - shares
9 Months Ended
Sep. 30, 2021
Nov. 12, 2021
Document Information Line Items    
Trading Symbol ATNM  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   22,030,838
Amendment Flag false  
Entity Central Index Key 0001388320  
Entity Current Reporting Status Yes  
Entity Filer Category Non-accelerated Filer  
Document Period End Date Sep. 30, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Document Quarterly Report true  
Document Transition Report false  
Entity File Number 001-36374  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 74-2963609  
Entity Address, Address Line One 275 Madison Ave, 7th Floor  
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 NYSEAMER  
Entity Interactive Data Current Yes