Document and Entity Information - shares
6 Months Ended
Jun. 30, 2017
Aug. 08, 2017
Document And Entity Information    
Entity Registrant Name Retrophin, Inc.  
Entity Central Index Key 0001438533  
Trading Symbol rtrx  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   38,385,466
Document Type 10-Q  
Document Period End Date Jun. 30, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2