XML 12 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2021
Aug. 02, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Entity File Number 001-37635  
Entity Registrant Name AXSOME THERAPEUTICS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-4241907  
Entity Address, Address Line One 22 Cortlandt Street  
Entity Address, Address Line Two 16th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10007  
City Area Code 212  
Local Phone Number 332-3241  
Title of 12(b) Security Common Stock, Par Value $0.0001 Per Share  
Trading Symbol AXSM  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   37,681,948
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001579428  
Amendment Flag false