v3.19.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document and Entity Information    
Entity Registrant Name Assertio Therapeutics, Inc.  
Entity Central Index Key 0001005201  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding (in shares)   64,826,248
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Current Reporting Status Yes  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false