v3.19.2
Cover Page - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2019  
Document Transition Report false  
Entity File Number 001-35518  
Entity Registrant Name SUPERNUS PHARMACEUTICALS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-2590184  
Entity Address, Address Line One 1550 East Gude Drive  
Entity Address, City or Town Rockville   
Entity Address, State or Province MD  
Entity Address, Postal Zip Code 20850  
City Area Code 301  
Local Phone Number 838-2500  
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  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Entity Common Stock, Shares Outstanding   52,449,036
Trading Symbol SUPN  
Security Exchange Name NASDAQ  
Entity Central Index Key 0001356576  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2